Verse 16 serves as a transition between the subject of the future Joseph the seer and the future Moses the liberator. This is still a citation from Joseph of Egypt, though it is not clear how these verses are related to the previous ones. The "thus prophesied Joseph" is obviously an intercalation by Lehi, but we cannot tell if the Moses texts follow as closely to the Joseph prophecy as they appear to here. However, the rest of the transitional phrasing "I am sure of this thing, even as I as sure...." makes it fairly certain that this is a continuation of the citation with little or nothing removed.