In his editing for the 1837 edition, Joseph Smith sometimes replaced the biblical -(e)th ending with the expected third person singular ending -(e)s, as here in 1 Nephi 13:42. This kind of stylistic updating has never been systematically applied to the text. The critical text will restore in each case the original -(e)th ending whenever it is supported by the earliest text. The original text does have many examples of the standard -(e)s ending in the third person singular, so the critical text will not remove every instance of the modern ending. For further discussion, see inflectional endings in volume 3.
Summary: Based on the earliest textual sources, the original hath in 1 Nephi 13:42 should be restored.