1 Corinthians 15:6, 17, 42
1 Corinthians 15:6 NASB1995
After that He appeared to more than five hundred brethren at one time, most of whom remain until now, but some have fallen asleep
1 Corinthians 15:17 NASB1995
and if Christ has not been raised, your faith is worthless; you are still in your sins.
1 Corinthians 15:42 NASB1995
So also is the resurrection of the dead. It is sown a perishable body, it is raised an imperishable body