If you will fear Yahweh, and serve him, and listen to his voice, and not rebel against the commandment of Yahweh, and both you and also the king who reigns over you are followers of Yahweh your God, [well]:
which was their duty to do, and is expressed in the preceding clauses; and this therefore is rather a promise of some benefit and privilege to their duty, and to encourage them to it, since it stands opposed to the threatening of punishment in the next verse; and the words in the original are, "then shall ye c. be after the Lord your God" l: that is, though they had in effect rejected the Lord from being their King, by asking and having one yet notwithstanding, if they and their king were obedient to the commands of the Lord, he would not cast them off; but they should follow him as their guide, leader, and director, and he would protect and defend them as a shepherd does his sheep that follow after him; so Jarchi takes it to be a promise of long life and happiness to them and their king,