Brigham Young
"We will have revelations to know our forefathers clear back to Father Adam and Mother Eve, and we will enter into the temples of God and officiate for them. Then man will be sealed to man until the chain is made perfect back to Adam, so that there will be a perfect chain of Priesthood from Adam to the winding-up scene.

“This will be the work of the Latter-day Saints in the Millennium” (Discourses of Brigham Young, p. 116).