'Twelve' in the Bible

So they collected and filled twelve baskets full of pieces of the five barley loaves left over by those who had eaten.

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.

Jesus replied, "There are twelve hours in the day, aren't there? If anyone walks during the day he does not stumble, because he sees the light of this world.

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