For he clave. — And he held fast. Hezekiah’s pious feeling.
But kept. — And he kept. Hezekiah’s practice. The context shows that the “commandments” specially in the writer’s mind were those against polytheism.
Related Commentaries of 2 Kings 18:6
2 Kings 18:6
6 For he clave to the LORD, and departed not from following him, but kept his commandments, which the LORD commanded Moses.