en_tn/deu/04/20.md

brought you out of the iron furnace

Moses speaks of Egypt and the hard work the Israelites did there as if it were an oven in which iron is heated and the Israelites were the iron. Alternate translation: "brought you out of the land where people made you do hard work" (See: rc://en/ta/man/translate/figs-metaphor)

a people of his own inheritance

This is an idiom that can be translated "people who belong only to him." (See: rc://en/ta/man/translate/figs-idiom)