'Three Days and Three Nights' in the Bible

They gave him a piece of a cake of figs, and two clusters of raisins. when he had eaten, his spirit came again to him; for he had eaten no bread, nor drunk any water, three days and three nights.

Yahweh prepared a great fish to swallow up Jonah, and Jonah was in the belly of the fish three days and three nights.

For as Jonah was three days and three nights in the belly of the whale, so will the Son of Man be three days and three nights in the heart of the earth.