Those of us familiar with the ordinance of temple marriage may wonder what kind of marriages were performed among the Nephites after Christ's ministry. Mormon is intentionally silent about any new temple ordinances, but in this verse he hints that the marriages performed were according to a new order. First, he speaks of nondescript "promises" which could include the promises given to those entering the covenant of eternal marriage. Second, Mormon begins the next verse with a comment about how things were no longer done according to the Law of Moses. The new and everlasting covenant of marriage is contrasted, in his mind, with the old law with its performances and ordinances. Although it is possible to read too much into the scriptures, this interpretation seems natural and appropriate. The Book of Mormon often references temple doctrines but does so in a very subtle way.