'True God' in the Bible

And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.

For they themselves shew of us what manner of entering in we had unto you, and how ye turned to God from idols to serve the living and true God;

And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life.