Moses
Deuteronomy 4:3ESV·traditional attribution

Your eyes have seen what the LORD did at Baal-peor, for the LORD your God destroyed from among you all the men who followed the Baal of Peor.

John Calvin Reformed @genevareformer

3. Your eyes have seen what the Lord did. This enlargement more clearly shews that so conspicuous was the example given in the punishment, that it could not be hidden from even the most ignorant; for Moses does not here address those of refined judgment, but the common people generally, who had only been spectators.

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

Your eyes have seen what the Lord did because of Baalpeor,.... Because of the idolatry the people of Israel fell into by worshipping that idol, being drawn into it by the daughters of Moab and Midian, through the counsel of Balaam, with whom they committed fornication; which led them to the other sin, and both highly provoking to God.