Augustine of Hippo : If I had been a Jew in the times of the ancient people, when there was nothing better to be, I would surely have accepted circumcision. That "seal of the justice of the faith" had so much power at that time, before it was rendered void by the coming of the Lord, that the angel would have strangled the infant son of Moses if his mother had not taken up a stone and circumcised the child and thus by this sacrament warded off his imminent destruction. This sacrament even tamed the river Jordan and reduced it to a brook. The Lord himself received this sacrament after birth, although on the cross he made it void. — LETTER 23 Augustine of Hippo : Why, therefore, was it commanded him that he should circumcise every male child in order on the eighth day, though it could not yet believe with the heart, that it should be counted unto it for righteousness, because the sacrament in itself was of great avail? And this was made manifest by the message of an angel in the case of Moses' son; for when he was carried by his mother, being yet uncircumcised, it was required, by manifest present peril, that he should be circumcised, and when this was done, the danger of death was removed. As therefore in Abraham the justification of faith came first, and circumcision was added afterwards as the seal of faith; so in Cornelius the spiritual sanctification came first in the gift of the Holy Spirit, and the sacrament of regeneration was added afterwards in the laver of baptism. — ON BAPTISM 4.24.32 Augustine of Hippo : Now there was a forecast of His coming undoubtedly contained not only in other sacred institutions of the ancient Jews, but also in their circumcision of the foreskin. For the eighth day, in the recurrence of weeks, became the Lord's day, on which the Lord arose from the dead; and Christ was the rock whence was formed the stony blade for the circumcision; and the flesh of the foreskin was the body of sin. — ON THE GRACE OF CHRIST AND ORIGINAL SIN 2.31.36 Ephrem the Syrian : At the place where they were spending the night, the Lord came upon Moses and wanted to kill him, because he had discontinued circumcision in Midian for one of his sons who had not been circumcised. From the day [the Lord] spoke with him on Horeb, he had not been united to his wife, who was distressed; and she was under judgment because she had not put full faith in his word. [Moses] blamed her for keeping his son from being circumcised. They spent the night [preoccupied] with these thoughts. Suddenly an angel appeared for both of these reasons, while seeming to appear only because of circumcision.[The angel] appeared to Moses in anger so that his departure [from Midian] would not be ridiculed because he had discontinued circumcision without necessity, while the Hebrews had not interrupted it in spite of the death of their children. Now whom should he have feared, God, who prescribed circumcision, or his wife, who had stood in the way of circumcision? When Moses' wife saw that he was about to die because she had stood in the way of circumcision, about which and on account of which he had argued with her that evening, "she took a piece of flint" and, still trembling from the vision of the angel, "circumcised her son," letting him be spattered with his [own] blood. Then she held the angel's feet and said, "I have a husband of blood. Do not cause suffering on the day of the celebration of circumcision." Because there was great joy on the day Abraham circumcised Isaac, she said, "I too have a husband of blood. If you do not [refrain from harm] on account of me, who circumcised my son with my own hands, or on account of Moses, refrain on account of the commandment of circumcision itself which has been observed." — COMMENTARY ON Exodus 4.4.1-3 Jerome : As regards Moses, it is clear that he would have been in peril at the inn, if Zipporah, which is by interpretation "a bird," had not circumcised her son and cut off the foreskin of marriage with the knife which prefigured the gospel. — AGAINST JOVINIAN 1.20