Therefore, the priesthood presidency of the Son of God belongs rightfully to the literal descendants of the chosen seed, to whom the covenant promises have been and will be made, and this same order that has always existed, will exist until the end of the world. Therefore, Adam, the president of the high priesthood in his day, spread the gospel with Seth, and came to confer priesthood on Enos, son of Seth, when he was a hundred and thirty-four years old.
...and that he should visit the sons of Noah; issuing an unalterable decree that a remnant of his seed would always be found among all nations as long as the earth subsisted; and the Lord said: Blessed is he by whose descendant the chosen seed shall come; for he shall be King over Zion, and shall reign over all the nations of the earth.
Sealed Book of Mor Chap.3:82 & Chap.4:57