Here the 1837 edition removed another Hebraistic use of the conjunctive and: namely, in the original text an and separates a preceding subordinate clause (in this case, a because-clause) from its following main clause (“then ye will not find no fault with him”). See, for instance, the nearby discussion under Helaman 12:13–21 regarding Hebraistic if-clauses. For other instances of this Hebrew-like construction in the original text, see under hebraisms in volume 3.
Summary: Restore in Helaman 13:28 the Hebraistic and that separates the because-clause from its following main clause.