John 17:3
and this is life eternal, to know Thee the only true God, and Jesus Christ whom thou hast sent.
Mark 12:29-32
And Jesus answered him, The first of all the commandments is, "Hear, O Israel, the Lord our God is the one Lord,
1 Timothy 2:5
For there is one God, and one Mediator between God and men, the man Christ Jesus:
John 10:30
I and the Father are one. Then the Jews again took up stones to stone Him.
1 Corinthians 8:4-6
As to the eating therefore of things sacrificed to idols, we know that an idol is nothing in the world, and that there is no other God but one.