English grammar requires the verb lie, not lay, when the verb is intransitive. Here in Omni 1:30, Joseph Smith’s editing for the 1837 edition follows this prescriptive rule. For a second example where Joseph removed such nonstandard usage from the text, see under Alma 24:23. And in one passage, the current LDS text retains the nonstandard use of have laid instead of the standard have lain (see 2 Nephi 9:7). For a complete discussion, see lay in volume 3.
Summary: Restore the intransitive use of the verb lay (in place of the prescriptive lie) in Omni 1:30; such nonstandard usage is frequent in the original Book of Mormon text.