passages from the old testament; stating there is only One God.

Deuteronomy 6:4

New International Version (NIV)

 ⁴ Hear, O Israel: The LORD our God, the LORD is one.
Isaiah 43:11-12

New International Version (NIV)

¹¹ I, even I, am the LORD,
   and apart from me there is no savior.
¹² I have revealed and saved and proclaimed—
   I, and not some foreign god among you.
You are my witnesses,” declares the LORD, “that I am God.

Isaiah 45:5-12

King James Version (KJV)

 ⁵I am the LORD, and there is none else, there is no God beside me: I girded thee, though thou hast not known me:
 ⁶That they may know from the rising of the sun, and from the west, that there is none beside me. I am the LORD, and there is none else.

Isaiah 46:9-11

King James Version (KJV)

 ⁹Remember the former things of old: for I am God, and there is none else; I am God, and there is none like me,

Exodus 20

New International Version (NIV)

Exodus 20

The Ten Commandments

 ¹ And God spoke all these words: ² “I am the LORD your God, who brought you out of Egypt, out of the land of slavery.
 ³ “You shall have no other gods before^[a] me.
 ⁴ “You shall not make for yourself an image in the form of anything in heaven above or on the earth beneath or in the waters below. ⁵ You shall not bow down to them or worship them; for I, the LORD your God