Augustine of Hippo
Catena Aurea · Johannesevangelium 1
And John bare record, saying, I saw the Spirit descending from heaven like a dove, and it abode upon him. And I knew him not: but he that sent me to baptize with water, the same said unto me, Upon whom thou shalt see the Spirit descending, and remaining on him, the same is he which baptizeth with the Holy Ghost. And I saw, and bare record that this is the Son of God.
(de Trin. xv. c. 46. [26.]) This was not however the first occasion of Christ’s receiving the unction of the Holy Spirit: viz. Its descent upon Him at His baptism; wherein He condescended to prefigure His body, the Church, wherein those who are baptized receive preeminently the Holy Spirit. For it would be absurd to suppose that at thirty years old, (which was His age, when He was baptized by John,) He received for the first time the Holy Spirit: and that, when He came to that baptism, as He was without sin, so was He without the Holy Spirit. For if even of His servant and forerunner John it is written, He shall be filled with the Holy Ghost, even from His mother’s womb; if He, though sprung from His father’s seed, yet receivedthe Holy Ghost, when as yet He was only formed in the womb; what ought we to think and believe of Christ, whose very flesh had not a carnal but spiritual conception?