Joab followed Adonijah's example (1 Kings 1:50). Joab hoped for mercy by holding onto the altar's horns, as allowed by the law of Moses (Exodus 21:12–14; Numbers 35:22–25; Deuteronomy 19:4–5). However, because Joab was a murderer, he could not receive mercy (see 2 Samuel 3:27; 18:14; 20:10).