——>That is a lie. God gave the Law to the Jewish people.
Genesis 26:5Because that Abraham obeyed my voice, and kept my charge, my commandments, my statutes, and my laws.
IT WAS KNOWN AND ABRAHAM KEPT IT.
Genesis 7:
1And the LORD said unto Noah, Come thou and all thy house into the ark; for thee have I seen righteous before me in this generation.
2Of every clean beast thou shalt take to thee by sevens, the male and his female: and of beasts that are not clean by two, the male and his female.
The distinction of clean and unclean was known to NOAH.