Romans 4:12 (WEB)
He is the father of circumcision to those who not only are of the circumcision, but who also walk in the steps of that faith of our father Abraham, which he had in uncircumcision.
Fathers and councils · 2
Irenaeus of Lyons
“As Paul does also testify, saying that we are children of Abraham because of the similarity of our faith, and the promise of inheritance.” — editor's note: Rom. iv. 12; Gal. iv. 28.
Read the whole comment
Tertullian
“For albeit it is subsequently that he is called “a father of many nations,” still it is of those (nations) who, as the fruit of the “faith” which precedes digamy, had to be accounted “sons of Abraham.”” — editor's note: See Rom. iv. 11, 12, Gal. iii. 7; and comp. Matt. iii. 9; John viii. 39.
Read the whole comment