In the one and thirtieth year of Asa king of Juda, Amri reigned over Israel twelve years: in Thersa he reigned six years.

In the thirty and first year of Asa king of Judah reigned hath Omri over Israel twelve years; in Tirzah he hath reigned six years,

In the thirty-first year of Asa, king of Judah, Omri became king over Israel, and he was king for twelve years; for six years he was ruling in Tirzah.

In the thirty-first year of Asa king of Judah, Omri began to reign over Israel for twelve years. He reigned six years in Tirzah.

In the thirty-first year of Asa, the king of Judah, Omri reigned over Israel for twelve years; he reigned for six years at Tirzah.

In the thirty and first year of Asa - There must be a mistake here in the number thirty-one; for, in 1-Kings 16:10 and 1-Kings 16:15, it is said that Zimri slew his master, and began to reign in the twenty-seventh year of Asa; and as Zimri reigned only seven days, and Omri immediately succeeded him, this could not be in the thirty-first, but in the twenty-seventh year of Asa, as related above. Rab. Song. Jarchi reconciles the two places thus: "The division of the kingdom between Tibni and Omri began in the twenty-seventh year of Asa; this division lasted five years, during which Omri had but a share of the kingdom. Tibni dying, Omri came into the possession of the whole kingdom, which he held seven years; this was in the thirty-first year of Asa. Seven years he reigned alone; five years he reigned over part of Israel; twelve years in the whole. The two dates, the twenty-seventh and thirty-first of Asa, answering, the first to the beginning of the division, the second to the sole reign of Omri." Jarchi quotes Sedar Olam for this solution.

In the thirty first year of Asa king of Judah began Omri to reign over Israel twelve years,.... Which are to be reckoned not from the thirty first of Asa; for Ahab the son of Omri began to reign in his thirty eighth year, and so his reign would be but seven or eight years; but they are reckoned from the twenty seventh of Asa, the beginning of it, when Elah was slain by Zimri, and he died, which to the end of the thirty eight of Asa make twelve years; for the division, according to the Jewish chronology (d), lasted four years; Jarchi says five (e); and from the beginning of that his reign is reckoned, though he did not reign over all Israel, or completely, until the thirty first of Asa, when Tibni died:
six years reigned he in Tirzah; the royal city of the kings of Israel, from Jeroboam to this time, and the other six he reigned in Samaria, built by him, as in the next verse.
(d) Seder Olam Rabba, c. 17. p. 45. (e) So Tzemach David, par. 1. fol. 11. 2.

OMRI BUILDS SAMARIA. (1-Kings 16:23-28)
In the thirty and first year of Asa . . . began Omri to reign--The twelve years of his reign are computed from the beginning of his reign, which was in the twenty-seventh year of Asa's reign. He held a contested reign for four years with Tibni; and then, at the date stated in this verse, entered on a sole and peaceful reign of eight years.

The Reign of Omri. - 1-Kings 16:23. Omri reigned twelve years, i.e., if we compare 1-Kings 16:15 and 1-Kings 16:23 with 1-Kings 16:29, reckoning from his rebellion against Zimri; so that he only possessed the sole government for eight years (or, more exactly, seven years and a few months), viz., from the 31st to the 38th years of Asa, and the conflict with Tibni for the possession of the throne lasted about four years. "At Thirza he reigned six years," i.e., during the four years of the conflict with Tibni, and after his death two years more.

Twelve years - That is, and he reigned twelve years, not from this thirty - first year of Asa, for he died in his thirty - eighth year, 1-Kings 16:29, but from the beginning of his reign, which was in Asa's twenty - seventh year, 1-Kings 16:15-16. So he reigned four years in a state of war with Tibni, and eight years peaceably.