John 17:3

And the Immortal Life is this--to know thee the one true God, and Jesus Christ whom thou has sent as thy Messenger.

Mark 12:29-32

"The first," answered Jesus, "is--'Hear, O Israel; the Lord our God is the one Lord;

1 Timothy 2:5

There is but one God, and one mediator between God and men--the man, Christ Jesus,

John 10:30

The Father and I are one."

1 Corinthians 8:4-6

With reference, then, to eating food that has been offered to idols-we are aware that an idol is nothing in the world, and that there is no God but one.

Treasury of Scripture Knowledge

Summary

Hear, O Israel: The LORD our God is one LORD:

General references

Bible References

General references

James 2:19
It is a part of your Faith, is it not, that there is one God? Good; yet even the demons have that faith, and tremble at the thought.