Moses
Deuteronomy 29:25ESV·traditional attribution

Then people will say, ‘It is because they abandoned the covenant of the LORD, the God of their fathers, which he made with them when he brought them out of the land of Egypt,

Matthew Henry Presbyterian @wholebiblehenry

It appears by the length of the sentences here, and by the copiousness and pungency of the expressions, that Moses, now that he was drawing near to the close of his discourse, was very warm and zealous, and very desirous to impress what he said upon the minds of this unthinking people.

Commenting on Deuteronomy 29:10-29

John Gill Reformed Baptist @doctorgill

For they went and served other gods, and worshipped them,.... As did all Israel, in the times of Solomon, and the ten tribes under Jeroboam, and other succeeding kings of Israel; and the two tribes in the times of Ahaz, and especially of Manasseh, when they worshipped all the host of heaven; see Kg1 11:33, gods whom they knew not; to whom they, as well...

Keil & Delitzsch Lutheran @keilanddelitzsch

Deu 29:24-25 “What is this great burning of wrath?” i.e., what does it mean - whence does it come? The reply to such a question would be (Deu 29:25-29): The inhabitants of the land have forsaken the covenant of the Lord, the God of their fathers; therefore has the wrath of the Lord burned over the land.

Commenting on Deuteronomy 29:24-25