And he said unto me: Thou rememberest the twelve apostles of the Lamb? Behold they are they who shall judge the twelve tribes of Israel; wherefore, the twelve ministers of thy seed shall be judged of them; for ye are of the house of Israel.
And these twelve ministers whom thou beholdest shall judge thy seed. And, behold, they are righteous forever; for because of their faith in the Lamb of God their garments are made white in his blood.
Source: 1 Nephi 12:9-10; The Book of Mormon: Another Testament of Jesus Christ