1 Kings 16:16

16:16 While deployed there, the army received this report: “Zimri has conspired against the king and assassinated him.” So all Israel made Omri, the commander of the army, king over Israel that very day in the camp.

1 Kings 16:23

16:23 In the thirty-first year of Asa’s reign over Judah, Omri became king over Israel. He ruled for twelve years, six of them in Tirzah.