Thomas
First appears at Matthew 10:3
First named in Scripture at Matthew 10:3 — read the chapter.
What Thomas Did
The apostle called Didymus, the Twin: when Jesus would return to Judea where the Jews sought to stone Him, Thomas rallied the rest; in the upper room his question drew the words "I am the way, the truth, and the life"; absent at the first appearance of the risen Lord, he demanded the print of the nails — and eight days later made the highest confession in the Gospels.
Accomplished for Good
"Let us also go, that we may die with him" (John 11:16) — a loyalty deeper than his doubts; and at last, seeing the wounds: "My Lord and my God" (John 20:28).
Mistakes and Failures
"Except I shall see in his hands the print of the nails, and put my finger into the print of the nails, and thrust my hand into his side, I will not believe" (John 20:25) — a week of unbelief while the church rejoiced, from the condition he set on believing.
From Easton’s Bible Dictionary (1897)
twin, one of the twelve (Matthew 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). Prom 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.
Reading photograph: “Colosseum in Rome, Italy - April 2007” — the Colosseum at dusk — by Diliff, CC BY-SA 2.5, via Wikimedia Commons — resized.