Moses
Deuteronomy 33:4BSB·traditional attribution

the law that Moses gave us, the possession of the assembly of Jacob.

John Calvin Reformed @genevareformer

4 Moses commanded us a law. What he had declared respecting the glory of God, and the excellency of the Law, he now applies to his own person, since it was his purpose, as I have said, to establish the authority of his own ministry.

Matthew Henry Presbyterian @wholebiblehenry

The first verse is the title of the chapter: it is a blessing. In the foregoing chapter he had thundered out the terrors of the Lord against Israel for their sin; it was a chapter like Ezekiel's roll, full of lamentation, and mourning, and woe.

Commenting on Deuteronomy 33:1-5

John Gill Reformed Baptist @doctorgill

And he was king in Jeshurun,.... That is, in Israel, or over the people of Israel, of which name of theirs; see Gill on Deu 32:15; either God, as Jarchi; for the government of the Israelites was a theocracy, and their laws were immediately from God, and by him they were guided and directed in all things; wherefore, when they were so importunate for a...