Hi again Boots.  Just so you know,  Jewish tradition tells us that Moses received the Ten Commandments on Mount Sinai and, there, the Almighty also revealed to him the entire Torah (the Five Books of Moses) along with all its laws and interpretations.  That would include what we know as Leviticus.  Moses then taught it to the children of Israel.  In other words, the Almighty didn't overlook anything at the time He gave us the Ten Commandments :)