Moses
Deuteronomy 4:14ESV·traditional attribution

And the LORD commanded me at that time to teach you statutes and rules, that you might do them in the land that you are going over to possess.

Matthew Henry Presbyterian @wholebiblehenry

This most lively and excellent discourse is so entire, and the particulars of it are so often repeated, that we must take it altogether in the exposition of it, and endeavour to digest it into proper heads, for we cannot divide it into paragraphs. I.

Commenting on Deuteronomy 4:1-40

John Gill Reformed Baptist @doctorgill

And the Lord commanded me at that time,.... When the ten commandments were delivered on Mount Sinai, and Moses was ordered to come up to God in the mount: to teach you statutes and judgments; laws ceremonial and judicial, besides the ten commands given them: that ye may do them in the land whither ye go over to possess it; the land of Canaan, which...

Keil & Delitzsch Lutheran @keilanddelitzsch

Deu 4:14 When the Lord Himself had made known to the people in the ten words the covenant which He commanded them to do, He directed Moses to teach them laws and rights which they were to observe in Canaan, viz., the rights and statutes of the Sinaitic legislation, from Ex 21 onwards.