Adam Clarke Bible Commentary

Thou shalt make the horns of it - The horns might have three uses: 1. For ornament. 2. To prevent carcasses, etc., from falling off. 3. To tie the victim to, previously to its being sacrificed. So David: Bind the sacrifice with cords to the horns of the altar; Psa 118:27. Horns were much used in all ancient altars among the heathen, and some of them were entirely constructed of the horns of the beasts that had been offered in sacrifice; but such altars appear to be erected rather as trophies in honor of their gods. On the reverses of several medals we find altars represented with horns at the corners. There is a medal of Antoninus on the reverse of which is an altar, on which a fire burns, consecrated Divi Pio, where the horns appear on each of the corners. There is one of Faustina, on which the altar and its horns are very distinct, the legend Pietas Augusta. All the following have altars with horns. One of Valerian, legend Consecratio; one of Claudius Gothicus, same legend; one of Quintillus, same legend; one of Crispina, with the legend Diis Genitalibus; and several others. See Numismatica Antiq., a Musellio, under Consecratio, in the index. Callimachus, in his Hymn to Apollo, line 60 introduces him constructing an altar of the horns of the animals slain by Diana: - πηξε δε βωμον Εκ κεραων κ. τ. λ. Martial has these words: Cornibus ara frequens.