'The Twelve' in the Bible

Now these are the names of the twelve apostles: the first, Simon, who is called Peter, and Andrew his brother; James the son of Zebedee, and John his brother;

Jesus said to them: Verily I say to you, That, in the restoration, when the Son of man shall sit on his glorious throne, you also who have followed me shall sit on twelve thrones, judging the twelve tribes of Israel.

And as Jesus was going up to Jerusalem, he took the twelve disciples aside on his journey, and said to them:

Then one of the twelve, called Judas Iscariot, went to the chief priests,

When the evening had come, he reclined at table with the twelve.

And while he was yet speaking, behold, Judas, one of the twelve, and with him a great multitude with swords and clubs, came from the chief priests and elders of the people.