Matthew 12

"For as Jonah was three days and three nights in the belly of the great fish, so will the Son of Man be three days and three nights in the heart of the earth." v.40

Read chapter 12.
Jonah was a type of Christ!  Don't you just love the connections of Old Testament passages to the New?! This verse is huge in figuring out the debate of how long was Jesus really dead.  If you go with tradition of Jesus dying on Good Friday and rising on Sunday, that isn't 3 full days and not at all 3 nights.  There's the debate that it doesn't have to mean full days here but actually in Greek they would use the phrase day and night when they wanted to reference the full 24 hour day than just a partial day.  So here the author is clearly trying to get across a full 72 hours.  Now to figure out what day Christ actually died on is for a longer study of scripture and not this quick devo, but definitely search it out.  Don't be afraid to deny man's traditions verses the Word of God.  Whether it seems like a big deal to you, don't be like Jonah in that not facing things of God you can escape God's will but that He crew and desires for you to know His will in all things no matter how big or small it seems to you.