2 Samuel 18:24; 2 Samuel 18:33

24 While David was sitting between the inner and outer gates, the watchman went up to the roof of the gateway by the wall. As he looked out, he saw a man running alone.
33 The king was shaken. He went up to the room over the gateway and wept. As he went, he said: "O my son Absalom! My son, my son Absalom! If only I had died instead of you--O Absalom, my son, my son!"