2 Samuel 12:20-23

20Then David got up from the ground, washed and anointed himself, changed his clothes, and went into the house of the LORD and worshiped. Then he went to his own house, and at his request they set food before him, and he ate.

21“What is this you have done?” his servants asked. “While the child was alive, you fasted and wept, but when he died, you got up and ate.”

22David answered, “While the child was alive, I fasted and wept, for I said, ‘Who knows? The LORD may be gracious to me and let him live.’ 23But now that he is dead, why should I fast? Can I bring him back again? I will go to him, but he will not return to me.”