'The Twelve' in the Bible

So Jesus asked the Twelve, "You don't want to leave, too, do you?"

Jesus answered them, "I chose you, the Twelve, didn't I? Yet one of you is a devil."

Now he was speaking about Judas, the son of Simon Iscariot, because this man was going to betray him, even though he was one of the Twelve.

Thomas, one of the Twelve (called the Twin), wasn't with them when Jesus came.