2 Samuel 13:1, 14, 28-29

It happened afterwards that Absalom the son of David had a beautiful sister whose name was Tamar, and Amnon [her half brother] the son of David was in love with her.

But he would not listen to her; and since he was stronger than she, he violated her and lay with her.

Now Absalom commanded his servants, “Notice carefully, when Amnon’s heart is joyous with wine, and when I say to you, ‘Strike Amnon,’ then kill him. Do not be afraid; have I not commanded you myself [and in doing so have I not taken full responsibility for his death]? Be courageous and brave.” So the servants of Absalom did to Amnon just as Absalom had commanded. Then all the king’s sons got up, and every man mounted his mule and fled.