Moses
Deuteronomy 31:13BSB·traditional attribution

Then their children who do not know the law will listen and learn to fear the LORD your God, as long as you live in the land that you are crossing the Jordan to possess.”

John Calvin Reformed @genevareformer

13. And that their children, which have not known anything. Again, we see that their present assembly is not referred to, but that which was to be repeated every seven years, in order that their posterity might be retained in the path of duty.

Matthew Henry Presbyterian @wholebiblehenry

The law was given by Moses; so it is said, Joh 1:17. He was not only entrusted to deliver it to that generation, but to transmit it to the generations to come; and here it appears that he was faithful to that trust. I. Moses wrote this law, Deu 31:9.

Commenting on Deuteronomy 31:9-13

John Gill Reformed Baptist @doctorgill

And the Lord said unto Moses,.... Either at the same time, or quickly after; rather, perhaps, the same day: behold, thy days approach that thou must die; which does not necessarily imply that he had some days to live, though but few; but that the time of his death drew nigh, his last moments were approaching; the time of his death being, as every man's...