[First Presidency Letter]
Yours of the 10th inst. is duly received. In it you desire to know if you who are of the pure blood of Israel should be permitted to adopt a child in the House of the Lord who is somewhat tinctured with negro blood. As you already know, the seed of Cain inherited the curse pronounced upon their progenitor by the Lord himself, and that curse will remain until He himself shall remove it. This unfortunate class of people are permitted to become members of the Church, but they are prohibited from bearing the priesthood, and therefore prohibited from entering the House of the Lord for ordinance purposes. But while this is the case we see no reason why the child referred to in your letter should not be permitted to be adopted into your family for the purpose of sharing your hospitality and protection.
[First Presidency, Letter to Samuel L. Moon and Virginia C. Moon, as quoted in Minutes of the Apostles of The Church of Jesus Christ of Latter-day Saints, 1835-1951, Electronic Edition, 2015]