And the LORD appointed a great fish to swallow up Jonah. And Jonah was in the belly of the fish three days and three nights. (Jonah 1:17 ESV).
For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth. (Matthew 12:40) (Note: Most other english translations use the word “fish and not “whale”).