'True God' in the Bible

Now for a long time Israel was without the TRUE God, and without a teaching priest, and without law.

But LORD is the TRUE God. He is the living God, and an everlasting King. At his wrath the earth trembles, and the nations are not able to abide his indignation.

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

For they report about us what kind of entrance we had with you, and how ye turned to God from the idols to serve a living and TRUE God,

And we know that the Son of God comes, and has given us understanding, so that we may know the true. And we are in the true, in his Son Jesus Christ. This is the TRUE God, and the eternal life.