מדרש על שמואל ב 13:22

“And when his brothers saw that their father loved him more than all his brothers, they hated him, and could not speak peaceably to him.” [Gen 37:4] Rabbi Ahva ben Zeira said: From the very disgrace of the tribal ancestors you learn their virtues. Elsewhere it says, “And Avshalom did not speak to Amnon for good or bad,” [Shmuel II 13:22] keeping in his heart what he felt in his heart. Whereas here, “And could not speak peaceably to him” – what was in their heart was on their tongues.