Adam Clarke on Jeremiah 10:16

The Portion of Jacob is not like them - Every nation had its tutelary god; this was its portion; in reference to this God says Deu 4:19, "He has divided the sun, moon, and stars, to all the nations under the heaven." And the Lord had taken the Israelites to be his portion; for "the Lord's portion is his people," Deu 32:9, and David says, "The Lord is the portion of mine inheritance," Psa 16:5; Psa 119:67. And hence Isaiah terms the smooth stones of the brook, to which Divine honors were paid, the portion of those idolaters, Isa 57:6. But in the text he says, "The Portion, i.e., the God of Jacob is not like them; for he is the former of all things," and they are formed by their foolish worshippers.