R' Akiva - Avot Derabbi Natan 6:1

[Yosei ben Yoezer said:] Let your house be a gathering place for the sages.
How so? This teaches us that a person’s house should always be open to the sages, and to their students, and their students’ students, so that a person should be able to say to his friend: I will save a place for you there! Another explanation: How should your house be a gathering place for the sages? When a student of the sages enters and says: Teach me! – if you have something to teach, teach it, but if not, let him go on his way. He should not sit before you on a bed, or a chair, or a bench. He should sit before you only on the ground. And anything that comes out of your mouth, he should accept with reverence, fear, quaking, and trembling.

Become dirty in the dust of their feet. How so? When a Torah scholar enters the city, do not say: I don’t need him. Instead, go to him. And do not sit next to him on a bed, or on a chair, or on a bench. Rather, sit before him on the ground, and accept upon yourself every word that comes from his mouth with fear and reverence, trembling and sweating, just as our forefathers accepted what they heard at Mount Sinai with fear and reverence, trembling and sweating.
Another explanation: Become dirty in the dust of their feet: This refers to Rabbi Eliezer; And drink in their words thirstily: This refers to Rabbi Akiva.
What were the origins of Rabbi Akiva? They say that he was forty years old and had still not learned anything. Once, he was standing at the mouth of a well and he said: Who carved a hole in this stone? They said to him: It is from the water, which constantly [falls] on it, day after day. And they said: Akiva, don't you know this from the verse (Job 14:19), “Water erodes stones”? Rabbi Akiva immediately applied this, all the more so, to himself. He said: If something soft can carve something hard, then all the more so, the words of Torah, which are like steel, can engrave themselves on my heart, which is but flesh and blood. He immediately went to start studying Torah. He went with his son and they sat down by the schoolteachers. He said to one: Rabbi, teach me Torah! He then took hold of one end of the tablet, and his son took hold of the other end. The teacher wrote down aleph and beit for him, and he learned them (aleph to tav, and he learned them; the book of Leviticus, and he learned it). And he went on studying until he learned the whole Torah. Then he went and sat before Rabbi Eliezer and Rabbi Joshua. My masters, he said, open up the sense of the Mishnah to me. When they told him one law, he went off and sat down to work it out for himself. (This aleph – what was it written for? That beit – what was it written for?) Why was this thing said? He kept coming back, and kept asking them, until he reduced his teachers to silence. Rabbi Shimon ben Elazar said: I will give you a parable to tell you what this was like: Like a stonecutter who was hacking away at the mountains. One time he took his pickaxe in his hand, and went and sat on top of the mountain, and began to chip small stones away from it. Some people came by and asked him: What are you doing? He said to them: I am going to uproot the mountain and throw it into the Jordan! They said to him: You cannot uproot the entire mountain! But he kept hacking away, until he came to a big boulder. So he wedged himself underneath it, pried it loose, and threw it into the Jordan. And he said to it: Your place is not here, but there! This is what Rabbi Akiva did to Rabbi Eliezer and Rabbi Tarfon. Rabbi Tarfon said to him: Akiva, it is about you that the verse says (Job 28:11), “He stops up the streams so that hidden things may be brought to light.” For Rabbi Akiva has brought to light things which are kept hidden from human beings.
Every day, he would bring a bundle of sticks, half of which he would sell to support himself and half he would use for kindling. His neighbors came and said to him: Akiva, you are choking us with all this smoke. Sell it all to us instead, and then buy oil with the money, and study by the light of a candle. He said to them: But I take care of many of my needs with it. I study [by its light]. I warm myself [by its fire]. And then I can [make it into a bed and] sleep on it.
All the poor will one day be judged against Rabbi Akiva, for if one says to them: Why did you never study? [And they say: Because] we were poor! then we will say to them: But wasn’t Rabbi Akiva even poorer, completely impoverished? [And if they say: It is because of our babies, we will say: But didn’t Rabbi Akiva] have sons and daughters as well? (But they will say: It is because) he merited to have his wife Rachel [to help him].
He was forty years old when he went to study Torah, and after thirteen years, he was teaching Torah to the masses. It was said that he did not leave the world until he had tables full of silver and gold, and he could go up to his bed on golden ladders. His wife would go out in a fancy gown and with golden jewelry with an engraving of Jerusalem on it. His students said: Rabbi, you are embarrassing us with what you have done for her. He said to them: She suffered greatly with me for the sake of Torah.

What were the origins of Rabbi Eliezer ben [Hyrcanus]? He was twenty-two [years old] and he had never studied Torah. One day [he said: I will go and study] Torah with Rabbi Yohanan ben Zakkai. His father, Hyrcanus, said to him: You will not eat until you have plowed a full plot of ground. He got up and plowed a full plot of ground. It is said that it was Friday, and so he went and ate with his father-in-law. But some say that he ate nothing from six hours before the Sabbath until six hours after the Sabbath. When he was on the road he saw a stone that looked like food and he took it and put it in his mouth. And some say that it was cow dung. He went and spent the night in an inn. Then he continued on, until he came before Rabbi Yohanan ben Zakkai in Jerusalem. Soon Rabbi Yohanan noticed Eliezer’s terrible breath. Rabbi Yohanan said: Eliezer, my son, have you eaten anything today? Eliezer said nothing. Rabbi Yohanan asked again and again; Eliezer said nothing. He sent a message to the inn, asking: Did Eliezer eat anything when he stayed with you? They replied: We thought perhaps he would be eating with the rabbi. He said: [I, likewise, thought perhaps he had eaten with you. Meanwhile, between our two assumptions, we ended up neglecting Eliezer. So Rabbi Yohanan said to Eliezer: Just as you have had this terrible smell coming from your mouth, so will you one day have a great reputation from the Torah coming from you.
His father, Hyrcanus, heard that he had gone to study Torah with Rabbi Yohanan ben Zakkai. He said to himself: I will go and force Eliezer to swear off any claim to my property. It is said that on that day, Rabbi Yohanan was sitting and interpreting Torah in Jerusalem, and all the great minds of Israel were sitting before him. He heard that Hyrcanus had come, and he spoke to the guards and said: If he tries to sit here, do not let him. He did try to sit, and they did not let him. So he went up several rows until he found a place near Tzitzit ben HaKeset, Nakdimon ben Gurion, and Kalba Savua. He sat down next to them, nervously. It is said that on that day, Rabbi Yohanan ben Zakkai looked at Rabbi Eliezer and said: Open our session with an interpretation. He replied: I cannot open. Rabbi Yohanan and the other students pressured him until he stood up ([and opened]) with an interpretation that no ear had ever heard before. At every word that came out of his mouth, Rabbi Yohanan ben Zakkai would stand up and kiss him on the head (and say to him: Eliezer, my rabbi, you have taught me truth!). Before the gathering ended, Hyrcanus stood up and said: Gentlemen, I came here in order to have my son swear off any claim to my property. But now all of my property will be given to my son Eliezer, and all his brothers will [get nothing!].
And why was that man called “Tzitzit HaKeset”? Because he would lean on a silver bed at the head of all the great minds of Israel.
They say about the daughter of Nakdimon ben Gurion that her bed was worth twelve thousand gold dinars, and that she would spend a gold dinar every week on cooking spices, and that she was waiting for levirate marriage.
And why was he called “Nakdimon ben Gurion”? Because the sun once came out (nakdah) for his sake. Once, the Jews were going up to Jerusalem for a festival, and they did not have water to drink. [Nakdimon ben Gurion] went up to a [gentile] general and said: Lend me the rights to twelve springs of water from now until a certain date in the future, and if I do not give you back twelve springs worth of water, I will give you twelve bars of silver. So they set a date. When the time came, the general sent a messenger, saying: Send me either the twelve springs worth of water or the twelve bars of silver. He replied: Wait, the day has still not ended. The general laughed at him and said: What, all year there has been no rain, and today you expect rain to fall? The general then went off to the bathhouse, quite pleased with himself. Nakdimon ben Gurion went to the study hall, wrapped himself in a prayer shawl, and stood in prayer and said: Master of the World, You know well that it is not for my own honor that I did this, nor for the honor of my father’s house, but only for Your honor, so that there would be water for those going up to the festival. Immediately, the sky filled with clouds and it began to rain so hard that it filled all twelve springs of water and then some. He sent a message to the general, saying: Send me money for the extra water you now have. The general replied: The sun has already set and the water that has fallen is now in my property. He went back to the study hall, wrapped himself in his prayer shawl, and stood in prayer and said: Master of the World, make a miracle for me at the end of the day as You did at the beginning. Immediately, the wind blew and the clouds parted, and the sun was shining. (The two met and the general said to Nakdimon: Now I know that the Holy Blessed One does not disturb the order of the world except for your sake.)
And why was he called “Kalba Savua”? Because anyone who went into his house as hungry as a dog (kelev) would come out of his house satiated (save’a). And when the emperor Vespasian came to destroy Jerusalem, the Zealots wanted to burn everything good in it to the ground. Kalba Savua said to them: Why do you want to destroy this city and burn everything good in it to the ground? Wait here for me and I will go in my house and show you what I have. He went in and found that he had enough grain to feed everyone in Jerusalem for twenty-two years. He immediately ordered that they pile it up, sift it, grind it, refine it, knead it, bake it, and prepare food for everyone in Jerusalem for twenty-two years. But [the zealots] would not listen to him. So what did the people of Jerusalem do? They brought calves and dragged them into pens, and then would grind them up in the mud. The people of Jerusalem would also boil straw and eat it. Those who were positioned on the walls of Jerusalem would say: If someone will give me five dates, I will go down and take five heads from Vespasian’s men. Vespasian examined their excrement and saw that there was no grain in it and said to his soldiers: These people who are eating nothing but straw are still killing you! If they could eat and drink all that you do, imagine how many more of you they would have killed!

Yosef ben Yohanan, a man of Jerusalem, would say: Let your house be open to all, let the poor be members of your household, and do not talk too much with married women.
Let your house be open to all. How so? This teaches that a person’s house should be open to all sides: the south, the east, the west, and the north. This is like Job, who made four doors to his house. And why did Job make four doors to his house? So that the poor would not have to trouble themselves to go around the whole house. Someone who came in from the north would enter from that direction, and someone who came in from the south would enter from that direction, and so with every direction. That is why Job made four doors to his house.
Let the poor be members of your household. Not that they will be actual members of your household, but they will speak of what they ate and drank in your house, in the way that they speak of what they ate and drank in the house of Job. For when they would meet, one would say to another: Where are you coming from? (And the other would reply:) From the house of Job; and where are you going? (And the first one would say:) To the house of Job.
So when all the great tragedies came upon him, Job said before the Holy Blessed One: Did I not feed the hungry and give drink to the thirsty? as it says (Job 31:17), “Did I ever eat my food alone, and not let orphan eat from it?” And did I not clothe the naked? as it says (Job 31:20), “He warmed himself from the shearings of my sheep.” And even so, these tragedies came upon me. The Holy Blessed One said to Job: Job, you still have not gotten to [even half] the level of Abraham. You sit and wait in your house, and guests come in to you. And if it is someone’s custom is to eat wheat bread, you feed him wheat bread. And if someone’s custom is to eat meat, you feed him meat. And if someone’s custom is to drink wine, you pour him wine. But Abraham did not do this. Rather, he sat and looked out at the world, and when he would see potential guests, he would go bring them into his house. And if someone was not accustomed to eating wheat bread, he would feed him wheat bread. And if someone was not accustomed to eating meat, he would feed him meat. And if someone was not accustomed to drinking wine, he would pour him wine. Not only that, but he built large booths out on the roads, where he would leave food and drink, and anyone who came by and entered would eat and drink and bless the heavens, and he would feel content. Anything that one could ask for was available in the house of Abraham, as it says (Genesis 21:33), “And he planted an Eshel tree in Beer Sheba.”