Jeremiah 9:25

circumcised, &c. : in the flesh, but not in "ears" (Jeremiah 6:10 ), nor in "heart" (Jeremiah 4:4 ). Reference to Pentateuch (Leviticus 26:41 , Leviticus 26:42 .Deuteronomy 10:16 ; Deuteronomy 30:6 ). Elsewhere only in Ezekiel 44:7 , Ezekiel 44:9 ,

with the uncircumcised = circumcised in uncircumcision: i.e. "circumcised [externally]who [are yet really] uncircumcised", as explained at the end of the next verse. Hence the contrast with the nations mentioned, which all practiced (external) circumcision (Romans 2:25-29 ).