In the thirty and one] Then was Tibni destroyed, and Omri reigned over all Israel quietly. The people made him king so soon as they heard that Zimri had kild his master, which was in the twenty and seventh yeer of Asa, v. 15, 16. But because it was uncertain, whether Omri or Tibni should carry the crown away, while Tibni lived, he is said to begin his reign four yeers after, in the thirty and one of Asa.
twelve yeers] These twelve yeers must needs be reckoned from the peoples first making him king in the twenty and seventh of Asa, because in the thirty eighth of Asa, Ahab the son of Omri began to reign, and that after the death of his father, v. 28, 29.
six yeers] Till he had bought Samaria, and built his palace there.