'Fasted' in the Bible

And they mourned, and wept, and fasted until even, for Saul, and for Jonathan his son, and for the people of the LORD, and for the house of Israel; because they were fallen by the sword.

David therefore besought God for the child; and David fasted, and went in, and lay all night upon the earth.

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.”

And he said, While the child was yet alive, I fasted and wept: for I said, Who can tell whether GOD will be gracious to me, that the child may live?