(8) But Naomi said to her two daughters-in-law, “Turn back, each of you to her mother’s house. May the LORD deal kindly with you, as you have dealt with the dead and with me! (9) May the LORD grant that each of you find security in the house of a husband!” And she kissed them farewell. They broke into weeping (10) and said to her, “No, we will return with you to your people.” (11) But Naomi replied, “Turn back, my daughters! Why should you go with me? Have I any more sons in my body who might be husbands for you? (12) Turn back, my daughters, for I am too old to be married. Even if I thought there was hope for me, even if I were married tonight and I also bore sons, (13) should you wait for them to grow up? Should you on their account debar yourselves from marriage? Oh no, my daughters! My lot is far more bitter than yours, for the hand of the LORD has struck out against me.” (14) They broke into weeping again, and Orpah kissed her mother-in-law farewell. But Ruth clung to her. (15) So she said, “See, your sister-in-law has returned to her people and her gods. Go follow your sister-in-law.” (16) But Ruth replied, “Do not urge me to leave you, to turn back and not follow you. For wherever you go, I will go; wherever you lodge, I will lodge; your people shall be my people, and your God my God. (17) Where you die, I will die, and there I will be buried. Thus and more may the LORD do to me if anything but death parts me from you.” (18) When [Naomi] saw how determined she was to go with her, she ceased to argue with her; (19) and the two went on until they reached Bethlehem.

The Sages taught in a baraita: With regard to a potential convert who comes to convert, at the present time (when the Jews are in exile) they say to him: What did you see that motivated you to come to convert? Don’t you know that the Jewish people at the present time are anguished, suppressed, despised, and harassed, and hardships are frequently visited upon them? If he says: "I know, and I am unworthy," they accept him immediately.

If he accepts upon himself all of these ramifications, then they circumcise him immediately. ...When he is healed from the circumcision, they immerse him immediately, and two Torah scholars stand over him at the time of his immersion and inform him of some of the lenient mitzvot and some of the stringent mitzvot. Once he has immersed and emerged, he is like a born Jew in every sense. For the immersion of a woman: Women appointed by the court seat her in the water of the ritual bath up to her neck, and two Torah scholars stand outside the bath house so as not to compromise her modesty, and from there they inform her of some of the lenient mitzvot and some of the stringent mitzvot.

The Master said in the baraita: "With regard to a potential convert who comes to a court in order to convert, the judges of the court say to him: What did you see that motivated you to come to convert? And they inform him of some of the lenient mitzvot and some of the stringent mitzvot."

The Gemara asks: What is the reason to say this to him? It is so that if he is going to withdraw from the conversion process, let him withdraw already at this stage. He should not be convinced to continue, as Rabbi Ḥelbo said: Converts are as harmful to the Jewish people as a leprous scab [sappaḥat] on the skin, as it is written: “And the convert shall join himself with them, and they shall cleave [venispeḥu] to the house of Jacob” (Isaiah 14:1).

There was another incident involving one gentile who came before Shammai and said to Shammai: Convert me on condition that you teach me the entire Torah while I am standing on one foot. Shammai pushed him away with the builder’s cubit (measuring stick) in his hand. The same gentile came before Hillel. He converted him and said to him: That which is hateful to you do not do to another; that is the entire Torah, and the rest is its interpretation. Go study.

Rabbi Avraham the proselyte interpreted this passage as follows: since proselytes are knowledgeable about the Mitzvot and observe them carefully, they are difficult for the people of Israel as a sore, since the Holy Blessed One pays special attention to the sins of Israel when they do not do God’s will.... [because there is such a marked contrast between the knowledge and observants of converts and of born Jews].

The Sages taught: One who verbally mistreats the convert violates three prohibitions.... “And you shall not mistreat a convert (ger)” (Exodus 22:20); “And when a convert (ger) lives in your land, you shall not mistreat him” (Leviticus 19:33); “And you shall not mistreat, each man his fellow” (Leviticus 25:17).

Rav Ashi said: Even though proselytes were not at Mount Sinai, their guardian angels were present, as it is written: “It is not with you alone that I make this covenant and this oath, but with he that stands here with us today before the Lord our God, and with he that is not here with us today” (Deuteronomy 29:13–14).