'Three Days and Three Nights' in the Bible

They gave him part of a fig cake and two bunches of raisins. After he had eaten, he revived, since he had neither eaten food nor had he drunk water for three days and three nights.

Now the LORD had prepared a large sea creature to swallow Jonah, and Jonah was inside the sea creature for three days and three nights.

because just as Jonah was in the stomach of the sea creature for three days and three nights, so the Son of Man will be in the heart of the earth for three days and three nights.