One came and said unto him, Good Master, what good thing shall I do, that I may have eternal life? And he (Jesus) said unto him, Why callest thou me good? There is none good but one, that is, God.
(Matthew 19:16 -17, in King James Version)
Now this is life eternal, that they know you, the only true God, and Jesus Christ, whom you have sent. (John 17:3)
Worship the Lord your God, and serve Him only. (Matthew 4:10)
Here O Israel: The Lord our God is One Lord. (Mark 12:29)
For there is one God and there is one mediator between God and men, the man Christ Jesus. (1Timothy 2:5)