John 11:16

11:16 So Thomas (called Didymus) said to his fellow disciples, “Let us go too, so that we may die with him.”

John 20:26-29

20:26 Eight days later the disciples were again together in the house, and Thomas was with them. Although the doors were locked, Jesus came and stood among them and said, “Peace be with you!” 20:27 Then he said to Thomas, “Put your finger here, and examine my hands. Extend your hand and put it into my side. Do not continue in your unbelief, but believe.” 20:28 Thomas replied to him, “My Lord and my God!” 20:29 Jesus said to him, “Have you believed because you have seen me? Blessed are the people who have not seen and yet have believed.”

John 21:2

21:2 Simon Peter, Thomas (called Didymus), Nathanael (who was from Cana in Galilee), the sons of Zebedee, and two other disciples of his were together.