John 20:24
But Thomas (who was called the Twin), one of the twelve, was not with them when Jesus came — Thomas's absence is theologically significant; his subsequent demand for direct sensory proof establishes the necessity of faith without sight. The epithet 'Twin' (Didymos) is unexplained but may suggest division or doubling (his coming faith will be doubled/confirmed). His being 'one of the twelve' situates him within the apostolic community despite his isolation.