Twin, one of the twelve (Matt. 10:3; Mark 3:18, etc.). He was also called Didymus (John 11:16; 20:24), which is the Greek equivalent of the Hebrew name. All we know regarding him is recorded in the fourth Gospel (John 11:15, 16; 14:4, 5; 20:24, 25, 26-29). From the circumstance that in the lists of the apostles he is always mentioned along with Matthew, who was the son of Alphaeus (Mark 3:18), and that these two are always followed by James, who was also the son of Alphaeus, it has been supposed that these three, Matthew, Thomas, and James, were brothers.
Thomas
“Let us also go, that we may die with him.” Thomas, called Didymus, says this to his fellow disciples, and it is a blunt, loyal thing to say. His name appears in each list of the twelve, but the best-known scene comes after the resurrection. The doors are shut, Jesus stands among them, and he offers Thomas his hands and side. Thomas answers in five words: “My Lord and my God.” Jesus then says, “blessed are they that have not seen, and yet have believed.” John 20:26-29 holds the whole exchange.
7 verses
Matthew
Philip, and Bartholomew; Thomas, and Matthew the publican; James the son of Alphaeus, and Lebbaeus, whose surname was Thaddaeus;
Mark
And Andrew, and Philip, and Bartholomew, and Matthew, and Thomas, and James the son of Alphaeus, and Thaddaeus, and Simon the Canaanite,
John
Then said Thomas, which is called Didymus, unto his fellowdisciples, Let us also go, that we may die with him.
And after eight days again his disciples were within, and Thomas with them: then came Jesus, the doors being shut, and stood in the midst, and said, Peace be unto you.
Then saith he to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust it into my side: and be not faithless, but believing.
And Thomas answered and said unto him, My Lord and my God.
Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed are they that have not seen, and yet have believed.
From Easton's Bible Dictionary
Matthew George Easton, 1897