'Faithfully' in the Bible

and so that the Lord will carry out His promise that He made to me: ‘If your sons are careful to walk faithfully before Me with their whole mind and heart, you will never fail to have a man on the throne of Israel.’

Solomon replied, "You demonstrated great loyalty to your servant, my father David, as he served you faithfully, properly, and sincerely. You have maintained this great loyalty to this day by allowing his son to sit on his throne.