The Affirmation of Pre-Adamites by Joseph and Hyrum Smith and Orson Hyde

In an entry dated 28 April, 1844 (JS, History, 1838–1856, vol. E-1), Joseph Smith (and his brother Hyrum) affirmed the concept of Pre-Adamites (emphasis added):

28 April 1844 • Sunday

<28> Sunday 28. At home, a beautiful clear day.

My brother 

Hyrum [Smith] preached at the 

stand in the morning, and among other things said the time will shortly come, that when one man makes another an offender for a word, he shall be cut off from the church of Jesus Christ. There were prophets before Adam, and Joseph has the spirit and power of all the Prophets.

Interestingly, other LDS who knew Joseph and Hyrum also taught this. In a sermon dated October 6, 1854, Orson Hyde taught that Adam and Eve were not the first humans on this planet; instead, there was a pre-Adamite population:

I will go back to the beginning, and notice the commandment that was given to our first parents in the garden of Eden. The Lord said unto them, "Multiply and replenish the earth." I will digress here for a moment from the thread of the subject, and bring an idea that may perhaps have a bearing upon it. The earth, you remember, was void and empty, until our first parents began at the garden of Eden. What does the term replenish mean? This word is derived from the Latin; "re" and "plenus;" "re" denotes repetition, iteration; and "plenus" signifies full, complete; then the meaning of the word replenish is, to refill, recomplete. If I were to go into a merchant's store, and find he had got a new stock of goods, I should say—"You have replenished your stock, that is, filled up your establishment, for it looks as it did before." "Now go forth," says the Lord, "and replenish the earth; for it was covered with gloomy clouds of darkness, excluded from the light of heaven, and darkness brooded. upon the face of the deep. The world was peopled before the days of Adam, as much so as it was before the days of Noah. It was said that Noah became the father of a new world, but it was the same old world still, and will continue to be, though it may pass through many changes. When God said, Go forth and replenish the earth; it was to replenish the inhabitants of the human species, and make it as it was before. (JOD: 2:79)