3 He committed all the sins his father had done before him; his heart was not fully devoted to the LORD his God, as the heart of David his forefather had been.

Read 1 Kings 15:3 Using Other Translations

And he walked in all the sins of his father, which he had done before him: and his heart was not perfect with the LORD his God, as the heart of David his father.
And he walked in all the sins that his father did before him, and his heart was not wholly true to the LORD his God, as the heart of David his father.
He committed the same sins as his father before him, and he was not faithful to the LORD his God, as his ancestor David had been.