See
So the other disciples told him, "We have seen the Lord!" But he said to them, "Unless I see the nail marks in his hands and put my finger where the nails were, and put my hand into his side, I will not believe it. A week later his disciples were in the house again, and Thomas was with them. Though the doors were locked, Jesus came and stood among them and said, "Peace be with you!"" (John 20:25-26)
Do not be unbelieving, but believing...
Then He said to Thomas, 'Reach here with your finger, and see My hands; and reach here your hand and put it into My side; and do not be unbelieving, but believing. Thomas said to him,
"My Lord and my God!" (John 20:28)