John 17:3
And in this consists the Life of the Ages--in knowing Thee the only true God and Jesus Christ whom Thou hast sent.
Mark 12:29-32
"The chief Commandment," replied Jesus, "is this: 'Hear, O Israel! The Lord our God is one Lord;
1 Timothy 2:5
For there is but one God and but one Mediator between God and men--Christ Jesus, Himself man;
John 10:30
I and the Father are one."
1 Corinthians 8:4-6
As to eating things which have been sacrificed to idols, we are fully aware that an idol is nothing in the world, and that there is no God but One.
Treasury of Scripture Knowledge
Bible References
General references
James 2:19
You believe that God is one, and you are quite right: evil spirits also believe this, and shudder."