Moses
Deuteronomy 4:20BSB·traditional attribution

Yet the LORD has taken you and brought you out of the iron furnace, out of Egypt, to be the people of His inheritance, as you are today.

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

But the Lord hath taken you, and brought you forth out of the iron furnace,.... The allusion is to the trying and melting of metals, and fleeing them from dross, by putting them into furnaces strongly heated, some of which are of earth, others of iron; the word, as the Jewish writers (g) observe, signifies such an one in which gold and silver and other...

Jamieson-Fausset-Brown Reformed @jfbcommentary

But the Lord hath taken you, and brought you forth out of the iron furnace--that is, furnace for smelting iron. A furnace of this kind is round, sometimes thirty feet deep, and requiring the highest intensity of heat. Such is the tremendous image chosen to represent the bondage and affliction of the Israelites [ROSENMULLER].