ואהבת לרעך

You shall not hate your kinsfolk in your heart. Reprove your kin but incur no guilt on their account.

You shall not take vengeance or bear a grudge against members of your people. Love your fellow [Israelite] as yourself: I am יהוה.

The strangers who reside with you shall be to you as your citizens; you shall love each one as yourself, for you were strangers in the land of Egypt: I יהוה am your God.

ואהבת לרעך כמוך THOU SHALT LOVE THY FELLOW MAN AS THYSELF —Rabbi Akiba said: “This is a fundamental principle of the Torah” (Sifra, Kedoshim, Chapter 4 12; Talmud Yerushalmi Nedarim 9:3).

4) "shall be to you the stranger that lives among you. And you shall love him as yourself." Just as it is written of Jews (Vayikra 19:18) "and you shall love your fellow as yourself," so is it written of proselytes "and you shall love him as yourself." "for you were strangers in the land of Egypt": Know the soul of the strangers, for you yourselves were strangers in the land of Egypt."

Each man is commanded to love each and every one of Israel as himself as [Leviticus 19:18] states: "Love your neighbor as yourself."
Therefore, one should speak the praises of [others] and show concern for their money just as he is concerned with his own money and seeks his own honor.
Whoever gains honor through the degradation of a colleague does not have a share in the world to come.

Whoever hates a [fellow] Jew in his heart transgresses a Torah prohibition as [Leviticus 19:17] states: "Do not hate your brother in your heart." One is not [liable for] lashes for violating this prohibition because no deed is involved.
The Torah only warns [us] against hating in [our] hearts. However, a person who beats a colleague or insults him, although he is not permitted to do so, does not violate [the prohibition,] "you shall not hate."

The commandment of love of Israel: To love [with] love of the soul each one of Israel — meaning to say that we have compassion for an Israelite and for his money, [just] like a person has compassion for himself and for his [own] money; as it stated (Leviticus 19:18), “you shall love your neighbor as yourself.” And they, may their memory be blessed, said (Shabbat 31a), “What is hateful to you, do not do to your fellow.” And they said in Sifra, Kedoshim, Chapter 4:12, “Rabbi Akiva said, ‘This is a great principle in the Torah’” — meaning to say that many commandments are dependent upon it. As one that loves his fellow like himself will not steal his money, have adultery with his wife, cheat his money from him nor hurt him from any angle. And so [too,] are there several other commandments dependent on this — the thing is well-known [revealed] to all who have intellect.

The root of the commandment is well-known — as in the way that he acts to his fellow, so will his fellow act to him. And there will be peace among the creatures with this.

And the laws of this commandment are included in the commandment, as the general principle of everything is that a man behave with his fellow in the way that a man behaves [with] himself — to guard his money and to distance all injury from him. And if he recounts things about him, he recounts them for praise, and he relates to his honor; and he does not become honored through his disgrace — and as they, may their memory be blessed, said (Talmud Yerushalmi Chagigah 2:1), “One who is honored by the disgrace of his fellow has no share in the world to come, but one who treats his fellow with love, peace and neighborliness, seeks their benefit and is happy about their good, the verse states about him, ‘Israel, through you will I be glorified’ (Isaiah 49:3).”

And this commandment is practiced in every place and at all times. And one who transgresses it and is not careful about the money of his fellow, to guard it — and all the more so, if he injures him with money or caused him pain in any matter, volitionally — has violated this positive commandment; besides the liability that there is in it according to the matter in which he injured him, as is explained in its place.

Loving a convert who has come to nestle under the wings of the Shechinah [fulfills] two positive commandments: one for he is [also] included among the "neighbors" [whom we are commanded to love] and one because he is a convert and the Torah (Deuteronomy 10:19) states: "and you shall love the converts."
[Thus, God] has commanded us concerning the love of a convert just as He has commanded us concerning loving Himself as [Deuteronomy 11:1] states: "and you shall love God, your Lord." The Holy One, blessed be He, Himself, loves converts as [Deuteronomy 10:18] states: "and He loves converts."

And you shall love your neighbor like yourself, [I am the Lord]: The explantion of the verse, "and you shall love your neighbor," is [that] just like you act towards your neighbor with love and unity - "like yourself, I am the Lord"; that I the Lord will be like yourself. And this is according to the secret of, "the Lord is your shadow" (Psalms 121:5), that is explained in the words of our Godly teacher, the Baal Shem Tov: That like a person behaves below with his friend and neighbor, with love and with proper traits, so too will the supernal King behave towards him. And it is like a shadow - that every movement that a a person makes, the shadow corresponds to it. So too is He, may He be blessed, with man. And that is [the meaning of], "and you shall love your neighbor" - that like yourself, I am the Lord," to also act towards you with love and all goodness. (Otzar HaChaim, Kedoshim, p. 172, column 4).

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 in his hand. This was a common measuring stick and Shammai was a builder by trade. 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.