In the pre-mortal existence, before the world was, God created a plan for His children and during this plan Satan rebelled against God. The Lord speaks to Moses and explains to him how Satan became the Devil;
“…That Satan, whom thou hast commanded in the name of mine Only Begotten, is the same which was from the beginning, and he came before me, saying—Behold, here am I, send me, I will be thy son, and I will redeem all mankind, that one soul shall not be lost, and surely I will do it; wherefore give me thine honor.” (Moses 4:1) Satan came to God in the pre-mortal existence and told God to send him as the Redeemer of Mankind. Satan promised that NO SOULS would be lost, but he demanded the entire honor for doing so. This of course would defeat the purpose of coming to the earth to obtain a body and earthly experiences; to be tried and tested.
But in that pre-mortal existence Jesus Christ came forth and said; “…Father, thy will be done, and the glory be thine forever.” (Moses 4:2) Jesus Christ would do as commanded and would give all the glory to the Father.
The Lord goes on to explain to Moses that; “…because that Satan rebelled against me, and sought to destroy the agency of man, which I, the Lord God, had given him, and also, that I should give unto him mine own power; by the power of mine Only Begotten, I caused that he should be cast down; And he became Satan, yea, even the devil, the father of all lies, to deceive and to blind men, and to lead them captive at his will, even as many as would not hearken unto my voice.” (Moses 4:3-4) Because Satan was cast out of the presence of God, this angered Him and Satan desired to make ALL miserable like unto himself.
God explains to Moses that “…the serpent was more subtle than any beast of the field which I, the Lord God, had made. And Satan put it into the heart of the serpent, (for he had drawn away many after him,) and he sought also to beguile Eve, for he knew not the mind of God, wherefore he sought to destroy the world.
And he said unto the woman: Yea, hath God said—Ye shall not eat of every tree of the garden? (And he spake by the mouth of the serpent.)
And the woman said unto the serpent: We may eat of the fruit of the trees of the garden; But of the fruit of the tree which thou beholdest in the midst of the garden, God hath said—Ye shall not eat of it, neither shall ye touch it, lest ye die.
And the serpent said unto the woman: Ye shall not surely die; For God doth know that in the day ye eat thereof, then your eyes shall be opened, and ye shall be as gods, knowing good and evil.” (Moses 4:5-11)
When Satan was cast out of Heaven, He brought with Him 1/3 of all the host of heaven. These were his followers. Satan knew that God had a plan for man (at this time, Adam and Eve). So Satan, knowing this plan came to Eve and tempted her to partake of the forbidden fruit.
“And when the woman saw that the tree was good for food, and that it became pleasant to the eyes, and a tree to be desired to make her wise, she took of the fruit thereof, and did eat, and also gave unto her husband with her, and he did eat. And the eyes of them both were opened, and they knew that they had been naked. And they sewed fig leaves together and made themselves aprons.” (Moses 4:12-13) After Satan had tempted Eve, she partook of the fruit, because she desired to be wise. Adam, having no other choice partook of the fruit also. God had commanded them to multiple and replenish the earth. If Adam had not partaken of the fruit, Eve would have been cast out of the Garden and reproduction would not have been possible. So Adam partook, that men might be!
Because Adam and Eve partook of the fruit, they now had knowledge of good and evil, and shortly after eating the fruit they were walking in the garden and heard the voice of God; “…and Adam and his wife went to hide themselves from the presence of the Lord God amongst the trees of the garden.
And I, the Lord God, called unto Adam, and said unto him: Where goest thou?
And he said: I heard thy voice in the garden, and I was afraid, because I beheld that I was naked, and I hid myself.
And I, the Lord God, said unto Adam: Who told thee thou wast naked? Hast thou eaten of the tree whereof I commanded thee that thou shouldst not eat, if so thou shouldst surely die?
And the man said: The woman thou gavest me, and commandest that she should remain with me, she gave me of the fruit of the tree and I did eat.
And I, the Lord God, said unto the woman: What is this thing which thou hast done? And the woman said: The serpent beguiled me, and I did eat.” (Moses 4:14-18)
Before partaking of the fruit, Adam and Eve did not know they were naked. They were both as little children in the garden. Partaking of the fruit was part of God’s plan, and part of our gift of Agency. Adam and Eve’s actions are known by some as the ‘Original Sin’, however, Adam and Eve did not sin, but rather used their agency to further the plan of God. As a result, we are separated from God physically and must rely on faith of His existence. Because of our Redeemer Jesus Christ, He gave us the ability to overcome this physical death and return to live with our Heavenly Father again.
Because of what had just occurred in the Garden of Eden, God punishes the Devil;
“…I, the Lord God, said unto the serpent: Because thou hast done this thou shalt be cursed above all cattle, and above every beast of the field; upon thy belly shalt thou go, and dust shalt thou eat all the days of thy life; And I will put enmity between thee and the woman, between thy seed and her seed; and he shall bruise thy head, and thou shalt bruise his heel.” (Moses 4:20) God gave man the ability to overcome Satan. God in fact took away much of the power of Satan from those who do not wish to follow him.
Because of Eve’s disobedience, God said; “…I will greatly multiply thy sorrow and thy conception. In sorrow thou shalt bring forth children, and thy desire shall be to thy husband, and he shall rule over thee.” (Moses 4:22) Child birth would be painful and Man would be placed as head of household.
God tells Moses that he also instructed Adam directly after their disobedience in the Garden of Eden;
“And unto Adam, I, the Lord God, said: Because thou hast hearkened unto the voice of thy wife, and hast eaten of the fruit of the tree of which I commanded thee, saying—Thou shalt not eat of it, cursed shall be the ground for thy sake; in sorrow shalt thou eat of it all the days of thy life. Thorns also, and thistles shall it bring forth to thee, and thou shalt eat the herb of the field. By the sweat of thy face shalt thou eat bread, until thou shalt return unto the ground—for thou shalt surely die—for out of it wast thou taken: for dust thou wast, and unto dust shalt thou return.” (Moses 4:23-25) When Adam and Eve were in the Garden of Eden they were taken care of, now because of their disobedience they would have to work for their food and endure hardships of the Earth.
Adam names Eve and calls her; “…the mother of all living…” (Moses 4:26) God makes them coats of skin to wear as clothing and God says to His Only Begotten [Jesus Christ]; “…Behold, the man is become as one of us to know good and evil…” (Moses 4:28) Adam and Eve made one step closer to becoming like their/our Heavenly Parents. We too, being offspring of an Eternal God, have the ability to become like Him and become gods. For Jesus Christ Said; “…Is it not written in your law, I said, Ye are gods?” (John 10:34)
God drove both Adam and Eve out of the Garden of Eden into the Earth, and placed a; “…cherubim and a flaming sword, which turned every way to keep the way of the tree of life.” (Moses 4:31) So that no one could gain access to the tree of life.