II Samuel 13:1, 14, 28-29

After this Absalom the son of David had a lovely sister, whose name was Tamar; and Amnon the son of David loved her.

However, he would not heed her voice; and being stronger than she, he forced her and lay with her.

Now Absalom had commanded his servants, saying, “Watch now, when Amnon’s heart is merry with wine, and when I say to you, ‘Strike Amnon!’ then kill him. Do not be afraid. Have I not commanded you? Be courageous and valiant.” So the servants of Absalom did to Amnon as Absalom had commanded. Then all the king’s sons arose, and each one got on his mule and fled.