Well, I'm quoting from the Bible then.
Hear, O Israel: The Lord our God is one Lord
And Jesus said unto him, Why callest thou me good? there is none good but one, that is, God.
And the scribe said unto him, Well, Master, thou hast said the truth: for there is one God; and there is none other but he:
And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord:
And Jesus said unto him, Why callest thou me good? none is good, save one, that is, God.
As concerning therefore the eating of those things that are offered in sacrifice unto idols, we know that an idol is nothing in the world, and that there is none other God but one.
Now a mediator is not a mediator of one, but God is one.