'The Twelve' in the Bible

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

And Jesus said to them, “Truly I say to you, that you who have followed Me, in the regeneration when the Son of Man will sit on His glorious throne, you also shall sit upon twelve thrones, judging the twelve tribes of Israel.

As Jesus was about to go up to Jerusalem, He took the twelve disciples aside by themselves, and on the way He said to them,

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

Now when evening came, Jesus was reclining at the table with the twelve disciples.

While He was still speaking, behold, Judas, one of the twelve, came up accompanied by a large crowd with swords and clubs, who came from the chief priests and elders of the people.