1 Corinthians 7:12 – To the rest I say (I, not the Lord) that if any brother has a wife who is an unbeliever, and she consents to live with him, he should not divorce her.
Paul spoke on his own authority.
John 12:49 – “For I have not spoken on My own authority, but the Father who sent Me has Himself given Me a commandment—what to say and what to speak. 50 And I know that His commandment is eternal life. What I say, therefore, I say as the Father has told Me.”
Jesus never spoke one word on His own authority.
Jesus > paul