Matthew 12:40: "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." 2 [If interpreted literally, this passage does conflict with other verses in the Bible which imply that Jesus was buried on a Friday afternoon, and resurrected very early on Sunday morning, totaling three days but only two nights.]
Acts 2:29-31: "...let me freely speak unto you of the patriarch David, that he is both dead and buried...Therefore being a prophet, and knowing that God had sworn with an oath to him, that of the fruit of his loins, according to the flesh, he would raise up Christ to sit on his throne; He seeing this before spake of the resurrection of Christ, that his soul was not left in hell, neither his flesh did see corruption."
Romans 10:6-7: " Say not in thine heart, Who shall ascend into heaven? (that is, to bring Christ down from above:) Or, Who shall descend into the deep? (that is, to bring up Christ again from the dead.)"
Ephesians 4:7-9: "But unto every one of us is given grace according to the measure of the gift of Christ. Wherefore he saith, When he ascended up on high, he led captivity captive, and gave gifts unto men. (Now that he ascended, what is it but that he also descended first into the lower parts of the earth?)"