Augustine of Hippo
Catena Aurea · Lukasevangelium 3
Now when all the people were baptized, it came to pass, that Jesus also being baptized, and praying, the heaven was opened, And the Holy Ghost descended in a bodily shape like a dove upon him, and a voice came from heaven, which said, Thou art my beloved Son; in thee I am well pleased.
(de Con. Ev. lib. ii. c. 14.) But the words of Matthew, This is my beloved Son, and those of Luke, Thou art my beloved Son, convey the same meaning; for the heavenly voice spoke one of these. But Matthew wished to shew that by the words, This is my beloved Son, it was meant rather to declare to the hearers, that He was the Son of God. For that was not revealed to Christ which He knew, but they heard it who were present, and for whom the voice came.