Throughout the BoM, we see the two great rites of the visionary men, the Worship of the Shalems and the Day of Atonement, appear paired together. They are the visions of 1 Nephi 8 and 1 Nephi 11-15; they are reflected in 1 Nephi 20 and 21; they are the rock and the salvation.
They appear again, paired in the wishes of the twelve Nephite disciples. The nine desired to come into the kingdom and rest; this is the Worship of the Shalems. The three desire to remain on earth until the Lord returns; this is the Day of Atonement.