Talmud sobre Números 20:20

Love peace. How so? This is to teach you to be a person who loves peace among all the people of Israel, just as Aaron loved peace between everyone, as it says (Malachi 2:6), “A Torah of Truth was on his mouth, and no crooked thing was on his lips. He walked with Me in peace and righteousness, and he pulled back many from sin.”
(Rabbi Meir would say: What do we learn from “he pulled back many from sin”?) When Aaron was walking down the road, and he came upon a wicked person, he would wish him Shalom. The next day, when that man wanted to sin, he would say: Alas! How will I be able to look Aaron in the face; I will be so embarrassed when he wishes me Shalom. And so this man would stop himself from sinning.
Similarly, when two people were fighting with one another, Aaron would go and sit next to one of them and say: My son, look at the anguish your friend is going through! His heart is ripped apart and he is tearing at his clothes. He is saying, How can I face my old friend? I am so ashamed, I betrayed his trust. Aaron would sit with him until his rage subsided. Then Aaron would go to the other person in the fight and say: My son, look at the anguish your friend is going through! His heart is ripped apart and he is tearing at his clothes. He is saying, How can I face my old friend? I am so ashamed, I betrayed his trust. Aaron would sit with him until his rage subsided. When the two people saw each other, they would embrace and kiss one another. And that is why it says (Numbers 20:20), “And the entire House of Israel wept for Aaron for thirty days” [after his death].