Here in Alma 13:9, an intrusive of was apparently inserted between “the Son” and “the Only Begotten of the Father” during the early transmission of the text. This same error seems to have also occurred in Alma 5:48. See the discussion under that passage for why this extra of entered the text. The critical text will read “the Son / the Only Begotten of the Father” in both Alma 5:48 and Alma 13:9.