That is that He commanded us to love each other like we love ourselves, and that one's love and compassion for one's brother be like the love and compassion for himself regarding his money - regarding his body and regarding everything that is in his domain. If he wants it, I want it; and all that I will want for myself, I will want the same for him. And that is His saying, "and you shall love your neighbor as yourself" (Leviticus 19:18). (See Parashat Kedoshim; Mishneh Torah, Human Dispositions 7.)

Speak to the whole Israelite community and say to them: You shall be holy, for I, your God יהוה, am holy.

דבר אל כל עדת בני ישראל SPEAK UNTO ALL THE CONGREGATION OF THE CHILDREN OF ISRAEL — This (the addition of the words כל עדת) teaches us that this section was proclaimed in full assembly because most of the fundamental teachings of the Torah are dependent on it (contained in it) (Sifra, Kedoshim, Section 1 1; Vayikra Rabbah 24:5).

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

“You shall love your neighbor as yourself”. Rebbi Aqiba says, that is a great principle in the Torah. Ben Azzai says, “this is the book of the descent of man” is a more important principle.

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.

It is a positive commandment of Rabbinic origin to visit the sick, comfort mourners, to prepare for a funeral, prepare a bride, accompany guests, attend to all the needs of a burial, carry a corpse on one's shoulders, walk before the bier, mourn, dig a grave, and bury the dead, and also to bring joy to a bride and groom and help them in all their needs. These are deeds of kindness that one carries out with his person that have no limit.Although all these mitzvot are of Rabbinic origin, they are included in the Scriptural commandment Leviticus 19:18: "Love your neighbor as yourself." That charge implies that whatever you would like other people to do for you, you should do for your comrade in the Torah and mitzvot.

They [each] said three things: Rabbi Eliezer said: Let the honor of your friend be as dear to you as your own; And be not easily provoked to anger; And repent one day before your death. And [he also said:] warm yourself before the fire of the wise, but beware of being singed by their glowing coals, for their bite is the bite of a fox, and their sting is the sting of a scorpion, and their hiss is the hiss of a serpent, and all their words are like coals of fire.

Rabbi Yose said: Let the property of your fellow be as precious unto you as your own; Make yourself fit to study Torah for it will not be yours by inheritance; And let all your actions be for [the sake of] the name of heaven.

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.

There are certain matters which are considered "the dust of lashon horah." What is implied? [For example, a person says:] "Who will tell so and so to continue acting as he does now," or "Do not talk about so and so; I do not want to say what happened," or the like.Similarly, it is also considered the "dust of lashon horah" when someone speaks favorably about a colleague in the presence of his enemies, for this will surely prompt them to speak disparagingly about him. In this regard, King Solomon said [Proverbs 27:14]: "One who greets his colleague early in the morning, in a loud voice, curses him," for his positive [act] will bring him negative [repercussions].Similarly, [to be condemned is] a person who relates lashon horah in frivolity and jest, as if he were not speaking with hatred. This was also mentioned by Solomon in his wisdom [Proverbs 26:18-19]: "As a madman who throws firebrands, arrows, and death and says: 'I am only joking.’”[Also, to be condemned is] someone who speaks lashon horah about a colleague slyly, pretending to be innocently telling a story without knowing that it is harmful. When he is reproved, he excuses himself by saying: "I did not know that the story was harmful or that so and so was involved."

AND THOU SHALT LOVE THY NEIGHBOR AS THYSELF. This is an expression by way of overstatement, for a human heart is not able to accept a command to love one’s neighbor as oneself. Moreover, Rabbi Akiba has already come and taught, “Your life takes precedence over the life of your fellow-being.” Rather, the commandment of the Torah means that one is to love one’s fellow-being in all matters, as one loves all good for oneself. It is possible that since it does not say “and thou shalt love ‘eth rei’acha’ as thyself,” but instead it likened them in the word ‘l’rei’acha’ [which literally means “to” thy neighbor], and similarly it states with reference to a proselyte, and thou shalt love ‘lo’ (him) [but literally: “to” him] as thyself, that the meaning thereof is to equate the love of both [himself and his neighbor, or himself and the proselyte] in his mind. For sometimes a person will love his neighbor in certain matters, such as doing good to him in material wealth but not with wisdom and similar matters. But if he loves him completely, he will want his beloved friend to gain riches, properties, honor, knowledge and wisdom. However [because of human nature] he will still not want him to be his equal, for there will always be a desire in his heart that he should have more of these good things than his neighbor. Therefore Scripture commanded that this degrading jealousy should not exist in his heart, but instead a person should love to do abundance of good for his fellow-being as he does for himself, and he should place no limitations upon his love for him. It is for this reason that it is said of Jonathan’s [love for David], for he loved him as he loved his own soul, because Jonathan had removed [altogether] the attribute of jealousy from his heart, and he said [to David], and thou shalt be king over Israel, etc.Our Rabbis have already explained the matters of taking vengeance and guarding a grudge [which are here forbidden], that they apply to cases where there is no monetary obligation, such as, “Lend me your sickle, lend me your hatchet.” For in a case where his friend owes him money, such as because of damage that he caused him or for similar reasons, one is not obliged to let his friend go free. On the contrary, he should sue him before the court and receive payment from him, on the basis of the verse which states, as he hath done, so shall it be done to him, and he [who caused the damage] is himself obliged to pay just as he must pay back that which he borrowed or robbed; and how much more so in matters of life, [the next of kin] should take vengeance and guard the grudge against the murderer, until the blood of his brother be redeemed by a court that will render judgment according to the laws of the Torah.