This goes without saying to God's elect people, but the fact is that God makes the law---not man.

James 4:12 There is one lawgiver, who is able to save and to destroy: who art thou that judgest another?

There is ONE lawgiver! And God is the One. The Bible is the law He has given. The Bible is the law book of God. What it says, and only what it says, is the supreme law which has come forth from the mouth of the One lawgiver.

‍