John 17:3
And this is life eternal, to know thee, the only true God, and Jesus Christ whom thou has sent.
Mark 12:29-32
And Jesus answered him: The first commandment of all is, Hear, Israel, the Lord our God is one Lord.
1 Timothy 2:5
For there is one God, and one mediator between God and men, the man Christ Jesus,
John 10:30
I and my Father are one.
1 Corinthians 8:4-6
With respect, then, to the eating of meats offered to idols, we know that an idol is nothing in the world, and that there is no other God but one.
Treasury of Scripture Knowledge
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James 2:19
You believe that there is one God; you do well: the demons also believe, and tremble.