2 Samuel 12:21-23

21His advisers were amazed. “We don’t understand you,” they told him. “While the child was still living, you wept and refused to eat. But now that the child is dead, you have stopped your mourning and are eating again.”

22David replied, “I fasted and wept while the child was alive, for I said, ‘Perhaps the Lord will be gracious to me and let the child live.’

23But why should I fast when he is dead? Can I bring him back again? I will go to him one day, but he cannot return to me.”