They explained in Avot DeRabbi Natan how Aharon loved peace: When he would see two people quarreling, he would go to each one of them without the knowledge of his fellow and say to him, “Behold how your fellow is regretting and afflicting himself that he sinned against you; and he told me that I should come to you so that you will forgive him. And as a result of this, when they bumped into each other, they would kiss each other. And how would he bring people closer to the Torah? When he would know about someone that he committed a sin, he would befriend him and show him a friendly demeanor; and that man would be embarrassed and say [to himself], “If that righteous man would know my evil deeds, how much would he distance himself from me? And as a result of this, [that man] would change for the better. And this is what the prophet testifies about [Aharon] (Malachi 2), “In peace and in straightness did he walk with Me and he brought back many from sinning."