that you may fear the LORD your God, you and your son and your son’s son, by keeping all his statutes and his commandments, which I command you, all the days of your life, and that your days may be long.
Observe here, 1. That Moses taught the people all that, and that only, which God commanded him to teach them, Deu 6:1. Thus Christ's ministers are to teach his churches all that he has commanded, and neither more nor less, Mat 28:20. 2.
Commenting on Deuteronomy 6:1-3
That thou mightest fear the Lord thy God,.... Being taught to know the greatness of his being, and the nature of his mind and will, and the manner of his worship; and not with a slavish fear, but with a filial one, a reverential affection for God; being instructed in their duty, as of children, to their God and Father; see Deu 5:29.
That thou mayest fear the LORD thy God, to keep all his statutes and his commandments, which I command thee, thou, and thy son, and thy son's son, all the days of thy life; and that thy days may be prolonged. (a) A reverent face and love for God is the first beginning to keeping God's commandments.