'The Twelve' in the Bible

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

Jesus said to them, "Most certainly I tell you that you who have followed me, in the regeneration when the Son of Man will sit on the throne of his glory, you also will sit on twelve thrones, judging the twelve tribes of Israel.

As Jesus was going up to Jerusalem, he took the twelve disciples aside, and on the way he said to them,

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

Now when evening had come, he was reclining at the table with the twelve disciples.

While he was still speaking, behold, Judas, one of the twelve, came, and with him a great multitude with swords and clubs, from the chief priest and elders of the people.