Mark 12:32

And the scribe said unto him, Admirably, Master! thou hast spoken the very truth: for there is one God; and there is no other besides him:

Mark 12:29

Then Jesus replied to him, The first of all the commandments is, Hear O Israel; the Lord thy God is one Lord:

1 John 5:20-21

But we know that the Son of God hath come, and hath given to us understanding, that we might know the true God; and we are in him that is true, in his Son Jesus the Messiah. HE is the true God, and the life eternal.

Treasury of Scripture Knowledge

Summary

Unto thee it was shewed, that thou mightest know that the LORD he is God; there is none else beside him.

Bible References

None else

Mark 12:29
Then Jesus replied to him, The first of all the commandments is, Hear O Israel; the Lord thy God is one Lord:
1 John 5:20
But we know that the Son of God hath come, and hath given to us understanding, that we might know the true God; and we are in him that is true, in his Son Jesus the Messiah. HE is the true God, and the life eternal.