'Fasted' in the Bible

They mourned, wept, and fasted until the evening for those who died by the sword—for Saul, his son Jonathan, the Lord’s people, and the house of Israel.

David pleaded with God for the boy. He fasted, went home, and spent the night lying on the ground.

His servants asked him, “What did you just do? While the baby was alive, you fasted and wept, but when he died, you got up and ate food.”

He answered, “While the baby was alive, I fasted and wept because I thought, ‘Who knows? The Lord may be gracious to me and let him live.’