Matthew 12:39-40

39Jesus replied, ‘The people who are alive today are very bad. They do not obey God, but they want God to show them something powerful. But God will not do this for them. They will only see the same powerful thing that God did for his prophet Jonah.

40Jonah stayed inside a big fish for three days and three nights. In the same way, the Son of Man will remain in the ground for three days and three nights.