Ambrose of Milan
A man, enlightened by foresight regarding the greatness of the forthcoming sacrament, turned his attention away. In alignment with the prophecy, he utilized the calf he had prepared to dismantle his father's idols. With his own hands, he offered another seven-year-old calf to God. In this demonstration, Gideon unmistakably illustrated that following the arrival of the Lord, all pagan offerings were to be consumed by fire, for the singular sacrifice of the Lord's sufferings would be presented to God for the salvation of humanity. This calf symbolized Christ, in whom, as spoken by Isaiah (Isaiah 11:2), the seven spiritual gifts would reside in their entirety. This same calf was offered by Abraham when he beheld the day of the Lord and experienced joy (John 8:56).
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Thus, on one hand, the Lord is depicted as a goat, on another as a lamb, and on the third as a bullock. The goat represents the sacrifice for sin, the ram symbolizes a voluntary offering, and the bullock signifies a pure sacrifice.