II 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 urged him; so he let Amnon and all the king’s sons go with him. 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.”