27 Then Gideon took ten men of his servants, and did as the LORD had said unto him: and so it was, because he feared his father's household, and the men of the city, that he could not do it by day, that he did it by night.
Then the man, instructed and fore-knowing what was to be, observes the heavenly mysteries, and therefore, according to the warning, slew the bullock destined by his father to idols, and himself offered to God another bullock seven years old. By doing which he most plainly showed that after the coming of the Lord all Gentile sacrifices should be done away, and that only the sacrifice of the Lord's passion should be offered for the redemption of the people. For that bullock was, in a type, Christ, in Whom, as Esaias said, dwelt the fulness of the seven gifts of the Spirit. This bullock Abraham also offered when he saw the day of the Lord and was glad. He it is Who was offered at one time in the type of a kid, at another in that of a sheep, at another in that of a bullock. Of a kid, because He is a sacrifice for sin; of a sheep, because He is an unresisting victim; of a bullock, because He is a victim without blemish.
[AD 397] Ambrose of Milan on Judges 6:25-27