First Council of the Seventy, on April 29, 1837, resolves to have no fellowship with any elder "who is guilty of polygamy."
First Council of the Seventy Minutes, April 29, 1837, Record of Seventies, 57
Resolved: That we have no fellowship whatever with any elder belonging to the quorum of the seventies who is guilty of polygamy in any shape and does not in all cases of like nature conform to the Laws of the Church as made known in the book doctrine and covenants and in the Bible.