But Thomas, one of the twelve, called Didymus, was not with them when Jesus came.
References for John 20:24
The other disciples therefore said to him, We have seen the Lord. But he said to them, Unless I see in his hands the mark of the nails, and put my finger into the mark of the nails, and put my hand into his side, I will not believe.
References for John 20:25
And eight days after, his disciples were again within, and Thomas with them. Jesus comes, the doors being shut, and stood in the midst and said, Peace [be] to you.
Then he says to Thomas, Bring thy finger here and see my hands; and bring thy hand and put it into my side; and be not unbelieving, but believing.
Thomas answered and said to him, My Lord and my God.
Jesus says to him, Because thou hast seen me thou hast believed: blessed they who have not seen and have believed.
Many other signs therefore also Jesus did before his disciples, which are not written in this book;
but these are written that ye may believe that Jesus is the Christ, the Son of God, and that believing ye might have life in his name.