Mark 12:32

And the scribes said to Him, Truly, Teacher; thou hast spoken in truth that He is One; and there is no other besides Him.

Mark 12:29

And Jesus responded to him, The first commandment of all; Hear, O Israel; The Lord our God, is one Lord:

1 John 5:20-21

But we know that the Son of God has come and has given unto us intelligence, that we know the truth. And we are in the true one, in his Son Jesus Christ; he is the true God, and eternal life.

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
And Jesus responded to him, The first commandment of all; Hear, O Israel; The Lord our God, is one Lord:
1 John 5:20
But we know that the Son of God has come and has given unto us intelligence, that we know the truth. And we are in the true one, in his Son Jesus Christ; he is the true God, and eternal life.