Here the 1837 edition omitted the demonstrative this, probably accidentally. Elsewhere in the text there are five other examples of “this our X”:
We have already discussed one other case where an original this occurring before a possessive pronoun was deleted (namely, from the phrase “this my people” in Mosiah 24:13). Also see the discussion under Mosiah 7:23 for additional examples of “this X”.
Summary: Restore the missing this in Alma 32:5 since this is how both manuscripts and the 1830 edition read.