Moses
Deuteronomy 4:10ESV·traditional attribution

how on the day that you stood before the LORD your God at Horeb, the LORD said to me, ‘Gather the people to me, that I may let them hear my words, so that they may learn to fear me all the days that they live on the earth, and that they may teach their children so.’

John Calvin Reformed @genevareformer

10. The day “In the day,” etc. — lat. that thou stoodest. The word day might be taken in the accusative, as if in apposition. It is, at any rate, clear that he explains more fully what he had briefly alluded to before, for he summons the people as eye-witnesses, lest, perchance, they should object that they were not sure from whence Moses had derived...

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

Specially the day that thou stoodest before the Lord in Horeb,.... Above all things Moses would have them take care not to forget the day the law was given from Mount Sinai, which was so awful and solemn, when they saw the fire, the smoke, the lightning, and heard the thunder and the sound of the trumpet; all which were very shocking and terrifying: and...