FP maintains that they taught plural marriage was necessary for exaltation.
The Executive Documents of the House of Representatives for the Second Session of the Fifty-Second Congress, 1892-1893 in Thirty-Four Volumes (Washington: Government Printing Office, 1893), 428
We, the first presidency and apostles of the Church of Jesus Christ of Latter-day Saints, beg respectfully to represent to tour excellency the following facts:
We formerly taught to our people that polygamy or celestial marriage, as commanded by God through Joseph Smith, was right; that it was a necessity to man's highest exaltation in the life to come.