Melachim Alef 16:23

23 In the thirty and first year of Asa Melech Yehudah began Omri to reign as Melech over Yisroel, reigning twelve years; shesh shanim reigned he in Tirtzah.

Melachim Alef 16:23 Meaning and Commentary

1 Kings 16:23

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 ^F4, lasted four years; Jarchi says five ^F5; 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.

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FOOTNOTES:

F4 Seder Olam Rabba, c. 17. p. 45.
F5 So Tzemach David, par. 1. fol. 11. 2.

Melachim Alef 16:23 In-Context

21 Then were HaAm Yisroel divided into two parts: half of the people followed Tivni Ben Ginat, to make him Melech; and half followed Omri.

22 But the people that followed Omri were stronger against the people that followed Tivni Ben Ginat; so Tivni died, and Omri reigned as Melech.

23 In the thirty and first year of Asa Melech Yehudah began Omri to reign as Melech over Yisroel, reigning twelve years; shesh shanim reigned he in Tirtzah.

24 And he bought the Har Shomron from Shemer for two talents of kesef, and built on the hill, and called the shem of the Ir which he built, after the shem of Shemer, adonei hahar (owner of the hill), Shomron.

25 But Omri wrought rah in the eyes of Hashem, and did sin more than all that were before him.