I will punish, viz. by the Babylonians, all them which are circumcised: q.d. Do not think to insist upon your external privilege of circumcision, that you are Abraham's natural seed, and thereby distinguished from other nations, as you sometimes were wont to do of the temple, that you had God in the midst of you. Do not think that shall privilege you: for you shall see it shall not be long ere I bring the Chaldeans upon those other nations, which either are circumcised in the flesh as well as you, and upon you also, who are uncircumcised in heart as well as they: or whether circumcision was lost, as being cast off by them, and so they were indeed uncircumcised; God tells them they shall fare alike: hence in the next verse he ranks Judah next to Egypt among the other uncircumcised nations; for he looks to the circumcision of the heart, not of the body; to inward worship, not outward only; therefore some read it the circumcised in uncirumcision.
Related Commentaries of Jeremiah 9:25
Jeremiah 9:25
25 Behold, the days come, saith the LORD, that I will punishg all them which are circumcised with the uncircumcised;