The worst way to understand the truth of the scriptures is to impose your beliefs on the scriptures. You may be able to find something that appears to agree with you….Maybe a single word that has multiple meanings that you base your desired beliefs on, but that is not how it is suppose to work…. You should agree with what the scriptures say as a whole.
Clear and concise scriptures present the strongest truths. If you look hard enough you can find something that present a vague meaning of what you want to believe….But in some case you have to ignore dozens or hundreds of scriptures that are very clear to base your beliefs on the vague. That is no way to formulate a belief.
Looking for vague scriptures and imaginative interpretation can produce a lot of false beliefs, beliefs that are distinctly non-biblical.
I can give you hundreds of scriptures that prove that the Godhead is made up of three Gods of separate minds and presence. And as far as Yahweh being the only God in the Old Testament, He makes that very clear Himself….As well as scriptures that prove that the people of the Old Testament understood that to be true.
“You are the Lord, you alone. You have made heaven, the heaven of heavens, with all their host, the earth and all that is on it, the seas and all that is in them; and you preserve all of them; and the host of heaven worships you.
Nehemiah 9:6
“You shall have no other gods before me.
Exodus 20:3
To you it was shown, that you might know that the Lord is God; there is no other besides him.
Deuteronomy 4:35
Know therefore today, and lay it to your heart, that the Lord is God in heaven above and on the earth beneath; there is no other.
Deuteronomy 4:39
Hear, O Israel: The Lord our God, the Lord is one.
Deuteronomy 6:4
“See now that I, even I, am he, and there is no god beside me; I kill and I make alive; I wound and I heal; and there is none that can deliver out of my hand.
Deuteronomy 32:39
And Hezekiah prayed before the Lord and said: “O Lord, the God of Israel, enthroned above the cherubim, you are the God, you alone, of all the kingdoms of the earth; you have made heaven and earth.
Isaiah 37:20
I am the Lord; that is my name; my glory I give to no other, nor my praise to carved idols.
Isaiah 42:8 (Of course they removed His name.)
“You are my witnesses,” declares the Lord, “and my servant whom I have chosen, that you may know and believe me and understand that I am he. Before me no god was formed, nor shall there be any after me.
Isaiah 43:10
I, I am the Lord, and besides me there is no savior.
Isaiah 43:11
I am the Lord, and there is no other, besides me there is no God; I equip you, though you do not know me,
Isaiah 45:5
Declare and present your case; let them take counsel together! Who told this long ago? Who declared it of old? Was it not I, the Lord? And there is no other god besides me, a righteous God and a Savior; there is none besides me.
Isaiah 45:21
Remember the former things of old; for I am God, and there is no other; I am God, and there is none like me,
Isaiah 46:9
That all the peoples of the earth may know that the Lord is God; there is no other. 1st Kings 8:60
There is none like you, O Lord, and there is no God besides you, according to all that we have heard with our ears. 1st Chronicles 17:20
Therefore you are great, O Lord God. For there is none like you, and there is no God besides you, according to all that we have heard with our ears. 2nd Samuel 7:22
And Hezekiah prayed before the Lord and said: “O Lord, the God of Israel, enthroned above the cherubim, you are the God, you alone, of all the kingdoms of the earth; you have made heaven and earth. 2nd Kings 19:15
But I am the Lord your God from the land of Egypt; you know no God but me, and besides me there is no savior.
Hosea 13:4
For you are great and do wondrous things; you alone are God. Psalm 86:10
Of course the Israelites were monotheistic ....one God.