Deuteronomy 11:1

Because God has made thee as the stars of heaven for multitude (so the preceding chapter concludes), therefore thou shalt love the Lord thy God (so this begins). Those whom God has built up into families, whose beginning was small, but whose latter end greatly increases, should use that as an argument with themselves why they should serve God. Thou shalt keep his charge, that is, the oracles of his word and ordinances of his worship, with which they were entrusted and for which they were accountable. It is a phrase often used concerning the office of the priests and Levites, for all Israel was a kingdom of priests, a holy nation. Observe the connection of these two: Thou shalt love the Lord and keep his charge, since love will work in obedience, and that only is acceptable obedience which flows from a principle of love. Jo1 5:3. Mention is made of the great and terrible works of God which their eyes had seen, Deu 11:7. This part of his discourse Moses addresses to the seniors among the people, the elders in age; and probably the elders in office were so, and were now his immediate auditors: there were some among them that could remember their deliverance out of Egypt, all above fifty, and to them he speaks this, not to the children, who knew it by hearsay only, Deu 11:2.

— Matthew Henry's Concise Commentary (public domain)