και 2532 CONJ πατερα 3962 N-ASM περιτομης 4061 N-GSF τοις 3588 T-DPM ουκ 3756 PRT-N εκ 1537 PREP περιτομης 4061 N-GSF μονον 3440 ADV αλλα 235 CONJ και 2532 CONJ τοις 3588 T-DPM στοιχουσιν 4748 5723 V-PAP-DPM τοις 3588 T-DPN ιχνεσιν 2487 N-DPN της 3588 T-GSF εν 1722 PREP τη 3588 T-DSF ακροβυστια 203 N-DSF πιστεως 4102 N-GSF του 3588 T-GSM πατρος 3962 N-GSM ημων 2257 P-1GP αβρααμ 11 N-PRI
Vincent's NT Word Studies
12. Father of circumcision. Of circumcised persons. The abstract term is used for the concrete. See on xi. 7.Who not only are - but who also walk. Apparently Paul speaks of two classes, but really of but one, designated by two different attributes. The awkwardness arises from the article toiv, erroneously repeated with stoicousin walk, which latter word expresses an added characteristic, not another class. Paul means that Abraham received a seal, etc., that he might be the father of circumcision to those who not only are circumcised, but who add to this outward sign the faith which Abraham exhibited.
Walk (stoicousin). See on elements, 2 Pet. iii. 10