2 Samuel 13:26-28

Then Absalom said, “If not, please let my brother Amnon go with us.” And the king said to him, “Why should he go with you?” But Absalom pressed him until he let Amnon and all the king’s sons go with him. Then Absalom commanded his servants, “Mark when Amnon’s heart is merry with wine, and when I say to you, ‘Strike Amnon,’ then kill him. Do not fear; have I not commanded you? Be courageous and be valiant.”