'True God' in the Bible

Now for a long season Israel hath been without the true God, and without a teaching priest, and without law.

And his servants spoke yet more against Jehovah, the true God, and against his servant Hezekiah.

When he prayed to the Lord, the Lord responded to him and answered favorably his cry for mercy. The Lord brought him back to Jerusalem to his kingdom. Then Manasseh realized that the Lord is the true God.