'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 the 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 withstand his indignation.

This is eternal life, that they may know you, the only true God, and him whom you sent, Jesus Christ.

For they themselves report concerning us what kind of a reception we had from you; and how you turned to God from idols, to serve a living and true God,

We know that the Son of God has come, and has given us an understanding, that we know him who is true, and we are in him who is true, in his Son Jesus Christ. He is the true God and eternal life.