Normally, the grammatical emendation of hath to has, when found in the text, is the result of Joseph Smith’s editing for the 1837 edition. In general, this editing was applied unevenly, as in this verse (where only the second instance of hath was changed to has in the 1837 edition). With regard to the first instance of hath, the 1874 RLDS made the change to has, perhaps in an attempt to increase the parallelism between these two phrases that refer to what the Lord said:
original text the Lord hath said ... yea and he hath also said
1837 text the Lord hath said ... yea and he has also said
RLDS text the Lord has said ... yea and he has also said
Of course, the critical text will restore the original text, with its parallelism (hath both times rather than has). For further discussion, see under infl al endings in volume 3.
Summary: Restore the two original occurrences of hath in Alma 34:36—and whenever else hath is found in the earliest textual sources.