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But Thomas, one of the twelve, called Didymus, was not with them when Jesus came. John 20:24
(Judas was dead by this time. See Matthew 27:5)
Then the eleven disciples went away into Galilee, into a mountain where Jesus had appointed them. And when they saw him,they worshipped him: but some doubted. Matthew 28:16-17Afterward he appeared unto the eleven as they sat at meat, and upbraided them with their unbelief and hardness of heart, because they believed not them which had seen him after he was risen. Mark 16:14
And they rose up the same hour, and returned to Jerusalem, and found the eleven gathered together, and them that were with them, ... And as they thus spake, Jesus himself stood in the midst of them, and saith unto them, Peace be unto you. But they were terrified and affrighted, and supposed that they had seen a spirit. Luke 24:33-37
And that he was seen of Cephas, then of the twelve. 1 Corinthians 15:5