Carl Friedrich Keil and Franz Delitzsch Old Testament Commentary

The news spread terror. All the guests of Adonijah fled, every man his way. Adonijah himself sought refuge from Solomon at the horns of the altar. The altar was regarded from time immemorial and among all nations as a place of refuge for criminals deserving of death; but, according to Exo 21:14, in Israel it was only allowed to afford protection in cases of unintentional slaying, and for these special cities of refuge were afterwards provided (Num 35). In the horns of the altar, as symbols of power and strength, there was concentrated the true significance of the altar as a divine place, from which there emanated both life and health (see at Exo 27:19). By grasping the horns of the altar the culprit placed himself under the protection of the saving and helping grace of God, which wipes away sin, and thereby abolishes punishment (see Bhr, Symbolik des Mos. Cult. i. p. 474). The question to what altar Adonijah fled, whether to the altar at the ark of the covenant in Zion, or to the one at the tabernacle at Gibeon, or to the one built by David on the threshing-floor of Araunah, cannot be determined with certainty. It was probably to the first of these, however, as nothing is said about a flight to Gibeon, and with regard to the altar of Araunah it is not certain that it was provided with horns like the altars of the two sanctuaries.