James 2:10; “For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.”
One Wife!
Doctrine and Covenants 49:16; “Wherefore, it is lawful that he should have one wife, and they twain shall be one flesh, and all this that the earth might answer the end of its creation.” [emp. mine]
Smith gave that revelation to Sidney Rigdon, Parley Pratt and Leman Copley May 7, 1831