Matthew 7:13–14 (King James Bible) enter ye in at the strait gate ... because strait is the gate and narrow is the way that leadeth unto life and few there be that find it
As explained under 1 Nephi 8:20, gates are referred to as being “strait” (that is, ‘narrow’) in the Book of Mormon text. The language is taken from the Sermon on the Mount, where the gate is, of course, narrow. In the manuscripts and early editions, the standard spelling distinction between strait and straight was basically ignored.