Nobody with the exception of his Church.
All the things I command you, be careful to do it. You shall not add to it, nor take away from it.If a prophet (i.e., one claiming to speak for God) rises among you, or a dreamer of dreams, and gives you a sign or a wonder, and the sign or the wonder which he foretold to you occurs, saying, Let us go after other gods which you have not known, and let us serve them, you shall not listen to the words of that prophet or that dreamer of dreams. For YHVH your God is testing you to know whether you love YHVH your God with all your heart and with all your soul.
You shall walk after YHVH your God and fear Him, and keep His commandments, and obey His voice, and you shall serve Him and hold fast to Him. And that prophet or that dreamer of dreams shall be put to death, because he has spoken to turn you away from YHVH your God, who brought you out of the land of Egypt and redeemed you out of the house of slaves, to thrust you out of the way in which YHVH your God commanded you to walk. So you shall put the evil away from the midst of you.
--Deuteronomy 12:32-13:5