John 17:3
and this is life eternal, to acknowledge thee to be the only true God, and Jesus to be the Messiah whom thou hast sent.
Mark 12:29-32
Jesus answer'd him, the first of all the commandments is thus deliver'd, "hear, o Israel, the lord our God is the only lord.
1 Timothy 2:5
for there is but one God, and but one mediator between God and men, the man Christ Jesus,
John 10:30
I and my father are one.
1 Corinthians 8:4-6
As to the eating therefore of what is offered in sacrifice to idols, we know that the heathen deities have no real existence, and that there is but one God.