Moses
Deuteronomy 11:1BSB·traditional attribution

You shall therefore love the LORD your God and always keep His charge, His statutes, His ordinances, and His commandments.

John Calvin Reformed @genevareformer

1. Therefore thou shalt love the Lord thy God. The whole address has this scope, that the people should testify their gratitude by their obedience, and thus being allured by God’s bounties, should reverently embrace His Law. On this account also, he requires them to love God, before he exhorts them to obey the Law itself.

Matthew Henry Presbyterian @wholebiblehenry

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.

Commenting on Deuteronomy 11:1-7

John Gill Reformed Baptist @doctorgill

Therefore thou shalt love the Lord thy God,.... Because he is so great and glorious in himself, and because he had done such great and good things for them, the Israelites, particularly in the multiplication of them, the last thing mentioned: and keep his charge; whatsoever the Lord had charged them to observe, even what follow: and his statutes and his judgments, and his commandments...