'The Twelve' in the Bible

Jesus, therefore, said to the twelve, 'Do ye also wish to go away?'

Jesus answered them, 'Did not I choose you -- the twelve? and of you -- one is a devil.

And he spake of Judas, Simon's son, Iscariot, for he was about to deliver him up, being one of the twelve.

And Thomas, one of the twelve, who is called Didymus, was not with them when Jesus came;