But one of the Twelve, Thomas (called "Twin"), was not with them when Jesus came.
References for John 20:24
So the other disciples kept telling him, "We have seen the Lord!" But he said to them, "If I don't see the mark of the nails in His hands, put my finger into the mark of the nails, and put my hand into His side, I will never believe!"
After eight days His disciples were indoors again, and Thomas was with them. Even though the doors were locked, Jesus came and stood among them. He said, "Peace to you!"
Then He said to Thomas, "Put your finger here and observe My hands. Reach out your hand and put it into My side. Don't be an unbeliever, but a believer."
Thomas responded to Him, "My Lord and my God!"
Jesus said, "Because you have seen Me, you have believed. Those who believe without seeing are blessed."
References for John 20:29
Jesus performed many other signs in the presence of His disciples that are not written in this book.
References for John 20:30
But these are written so that you may believe Jesus is the Messiah, the Son of God, and by believing you may have life in His name.
References for John 20:31