Ambrose of Milan

Not without reason or by excessive reaction do many find this passage disturbing, in that the Lord should say, "Any uncircumcised male who is not circumcised in the flesh of his foreskin shall be cut off from his people; he has broken my covenant." Indeed, it is not taken lightly that the negligence of the parents could bring punishment upon an eight-day-old infant, so much so that his soul would perish, while even in the case of homicide—committed, however, by one who had unintentionally killed a man—the law stipulated to what …

On Abraham ↗

Bede

A male whose foreskin's flesh has not been circumcised, that soul will be cut off from his people: because he has broken my covenant. By this sentence, the greater mystery of the same circumcision is revealed, which is not only a sign of renewal to come in Christ but also an abolition of the transgression committed in Adam; for what baptism now accomplishes through faith in Christ, circumcision accomplished from that time on the eighth day, which was a designation of Christ's resurrection; except that the entrance to the kingdom of …

Commentary on Genesis (Hexaemeron) ↗