The answer to another question referenced a website that discusses the LDS endowment ceremony. I was looking through the part about creation and was a bit surprised to see that the angel Michael actually takes on flesh and becomes Adam. I had read that Brigham Young had once taught the so-called "Adam-God" theory, but I had never heard the "Adam-Michael" concept.
JEHOVAH: Brethren and sisters, this is Michael, who helped form the earth. When he awakens from the sleep which we have caused to come upon him, he will be known as Adam and, having forgotten all, will have become as a little child.
So, my question is, "What specifically is the basis for the LDS teaching that Michael took on flesh and became Adam, the first man?" Is this in the D & C or anywhere else in particular?
With apologies to anyone who might be offended by this question... I understand that this is from the sacred endowment ceremony. However, I am asking just about the doctrine itself, which happens to appear in the endowment ceremony. I am assuming that the basis for the doctrine is not the ceremony itself, but comes from elsewhere. That is what I am asking about.