I Corinthians 15:6, 17, 42
I Corinthians 15:6 NKJV
After that He was seen by over five hundred brethren at once, of whom the greater part remain to the present, but some have fallen asleep.
I Corinthians 15:17 NKJV
And if Christ is not risen, your faith is futile; you are still in your sins!
I Corinthians 15:42 NKJV
So also is the resurrection of the dead. The body is sown in corruption, it is raised in incorruption.