'Judging' in the Bible

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.

that you may eat and drink at my table in my Kingdom. You will sit on thrones, judging the twelve tribes of Israel."

For what have I to do with also judging those who are outside? Don't you judge those who are within?