The verse states a king's mouth 'does not sin in judgment.' Is this a literal guarantee, or does it point to something deeper about responsibility and God's expectation?
This second part of the verse emphasizes the duty and ideal of kingly judgment. It doesn't claim that every king throughout history has been perfect, but rather that a righteous king, reflecting God's wisdom, should not err in his rulings. His decisions are meant to be free from injustice, bias, or error.
This is a high standard! It implies that a king's responsibility is immense. He is accountable not just to his people, but ultimately to God. The ideal is that his lips should not go astray from truth and justice, making his judgments a source of stability and rightness.