Although in most instances the original text seems to have preferred towards over toward, there are a few cases where the earliest extant text reads toward. Since both towards and toward are possible, the critical text will in each case follow the earliest textual sources. In this case, the 1841 British edition introduced towards into the LDS text; the 1858 Wright edition introduced it into the RLDS textual tradition, but the 1908 RLDS edition restored the earlier toward, either accidentally or by reference to 𝓟. The critical text will maintain toward, the reading of 𝓟, in this passage. For further discussion, see under 1 Nephi 5:22 as well as towards in volume 3.
Summary: Restore the original use of toward in Mosiah 15:9, the reading of the printer’s manuscript (the earliest extant reading for this passage).