'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 son of Zebedee, and John his brother;

Then said Jesus unto them, Verily I say unto you, That ye who have followed me in the regeneration, when the Son of man shall sit on the throne of his glory, ye also shall sit on twelve thrones, judging the twelve tribes of Israel.

And the twelve, on hearing this, were filled with indignation against the two brethren.

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

And when the evening was come, he sat down at table with the twelve.

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