John 17:3
And this is the eternal life, that they know Thee, the only true God, and Jesus Christ Whom Thou didst send.
Mark 12:29-32
Jesus answered, "The first is, 'Hear, O Israel; the Lord is our God, the Lord is One;
1 Timothy 2:5
For there is one God, one Mediator also between God and men, a Man, Christ Jesus,
John 10:30
I and the Father are One."
1 Corinthians 8:4-6
concerning, therefore, the eating of things sacrificed to idols, we know 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. You do well. The demons also believe, and shudder!