400
This was the reason Mormon abridged the small plates and added them to the Book of Mormon.
What is "for a wise purpose; for thus it whispereth me, according to the workings of the Spirit of the Lord which is in me. And now, I do not know all things; but the Lord knoweth all things which are to come; wherefore, he worketh in me to do according to his will."? (WoM 1:7)