If you fear the LORD and serve Him and obey His voice, and if you do not rebel against the command of the LORD, and if both you and the king who rules over you follow the LORD your God, then all will be well.
Samuel, having sufficiently secured his own reputation, instead of upbraiding the people upon it with their unkindness to him, sets himself to instruct them, and keep them in the way of their duty, and then the change of the government would be the less damage to them. I.
Commenting on 1 Samuel 12:6-15
If ye will fear the Lord, and serve him, and obey his voice,.... All worship and service of God, and obedience to his word and ordinances, should spring from fear and reverence of him; and therefore the whole of worship, both external and internal, is sometimes expressed by the fear of the Lord: and not rebel against the commandment of the Lord; break it, and...
If ye will fear the LORD, and serve him, and obey his voice, and not rebel against the commandment of the LORD, then shall both ye and also the king that reigneth over you continue following the LORD your God: (h) You shall be preserved as they that follow the Lord's will.