'True God' in the Bible

And this is life eternal, that they should know thee the only true God, and him whom thou didst send, even Jesus Christ.

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

And we know that the Son of God is come, and hath given us an understanding, that we 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.