Moses
Deuteronomy 27:10BSB·traditional attribution

You shall therefore obey the voice of the LORD your God and follow His commandments and statutes I am giving you today.”

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. A general charge to the people to keep God's commandments; for in vain did they know them, unless they would do them. This is pressed upon them, 1. With all authority. Moses with the elders of Israel, the rulers of each tribe (Deu 27:1), and again, Moses and the priests the Levites (Deu 27:9); so that the charge is given by Moses...

Commenting on Deuteronomy 27:1-10

John Gill Reformed Baptist @doctorgill

Thou shalt therefore obey the voice of the Lord thy God,.... In whatsoever he directs in his word, and by his prophets, and especially by his Son, eminently called the Word of the Lord: and do his commandments and his statutes, which I command thee this day; See Gill on Deu 27:1.

Geneva Bible Notes Reformed @genevanotes

Thou shalt therefore obey the voice of the LORD thy God, and do his commandments and his statutes, which I command thee this day. (e) This condition has bound you to it, that if you will be his people, you must keep his laws.