John 20:23-25

Amplified Bible

²³ If you forgive the sins of anyone they are forgiven [because of their faith]; if you retain the sins of anyone, they are retained [and remain unforgiven because of their unbelief].”

²⁴ But Thomas, one of the twelve [disciples], who was called Didymus (the twin), was not with them when Jesus came. ²⁵ So the other disciples kept telling him, “We have seen the Lord!” But he said to them, “Unless I see in His hands the marks of the nails, and put my finger into the nail prints, and put my hand into His side, I will never believe.”