John 17:3
And this is the eternal life; that they shall know thee, the only true God, and Jesus Christ whom thou hast sent.
Mark 12:29-32
Jesus answered, First is, Hear Israel, the Lord our God is one Lord;
1 Timothy 2:5
For there is one God, and one mediator of God and man, the man Christ Jesus,
John 10:30
I and the Father are one.
1 Corinthians 8:4-6
Concerning eating things 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
Bible References
General references
James 2:19
You believe that there is one God? You do well; demons also believe and tremble.