The Book of Moses (as well as the Book of Mormon) claims that Satan spoke directly with Cain, such as in Moses 5:18, 29-31:
And Cain loved Satan more than God. And Satan commanded him, saying: Make an offering unto the Lord.
And Satan said unto Cain: Swear unto me by thy throat, and if thou tell it thou shalt die; and swear thy brethren by their heads, and by the living God, that they tell it not; for if they tell it, they shall surely die; and this that thy father may not know it; and this day I will deliver thy brother Abel into thine hands.
And Satan sware unto Cain that he would do according to his commands. And all these things were done in secret.
And Cain said: Truly I am Mahan, the master of this great secret, that I may murder and get gain. Wherefore Cain was called Master Mahan, and he gloried in his wickedness.
This is curious because the Bible does not contain this detail, however it is supported by other Christian texts discovered after the publication of the Book of Moses (and Book of Mormon) such as Conflict of Adam and Eve with Satan and Book of the Bee.
What are the odds this would also show up in recently discovered texts?