John 20:28 (KJV)

Whose soever sins ye remit, they are remitted unto them; and whose soever sins ye retain, they are retained.

But Thomas, one of the twelve, called Didymus, was not with them when Jesus came.

The other disciples therefore said unto him, We have seen the LORD. But he said unto them, Except I shall see in his hands the print of the nails, and put my finger into the print of the nails, and thrust my hand into his side, I will not believe.

And after eight days again his disciples were within, and Thomas with them: then came Jesus, the doors being shut, and stood in the midst, and said, Peace be unto you.

Then saith he to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust it into my side: and be not faithless, but believing.

Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed are they that have not seen, and yet have believed.

And many other signs truly did Jesus in the presence of his disciples, which are not written in this book:

But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.