Albert Barnes Commentary Jeremiah 9:25

"Behold, the days come, saith Jehovah, that I will punish all them that are circumcised in [their] uncircumcision:" — Jeremiah 9:25 (ASV)

All those who are circumcised ... - Rather, “all circumcised in uncircumcision,” i.e., all who though outwardly circumcised have no corresponding inward purity.