John Chrysostom
Catena Aurea · Lukasevangelium 1
And it came to pass, that on the eighth day they came to circumcise the child; and they called him Zacharias, after the name of his father. And his mother answered and said, Not so; but he shall be called John. And they said unto her, There is none of thy kindred that is called by this name. And they made signs to his father, how he would have him called. And he asked for a writing table, and wrote, saying, His name is John. And they marvelled all. And his mouth was opened immediately, and his tongue loosed, and he spake, and praised God.
(in Gen. Hom. 39.) The rite of circumcision was first delivered to Abraham as a sign of distinction, that the race of the Patriarch might be preserved in unmixed purity, and so might be able to obtain the promises. But now that the promise of the covenant is fulfilled, the sign attached to it is removed. So then through Christ circumcision ceased, and baptism came in its place; but first it was right that John should be circumcised; as it is said, And it came to pass, that on the eighth day, &c. For the Lord had said, Let the child of eight days be circumcised among you. (Gen. 17:13.) But this measurement of time I conceive was ordered by Divine mercy for two reasons. First, because in its most tender years the child the more easily bears the cutting of the flesh. Secondly, that from the very operation itself we might be reminded that it was done for a sign; for the young child scarcely distinguishes any of the things that are around him. But after the circumcision, the name was conferred, as it follows, And they called him. But this was done because we must first receive the seal of the Lord, then the name of man. Or, because no man except he first cast aside his fleshly lusts, which circumcision signifies, is worthy to have his name written in the book of life.