1 Kings 16:23

23 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,

1 Kings 16:23 In-Context

21 Then are the sons of Israel parted into halves; half of the people hath been after Tibni son of Ginath to cause him to reign, and the half after Omri;
22 and stronger are the people that are after Omri than the people that are after Tibni son of Ginath, and Tibni dieth, and Omri reigneth.
23 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,
24 and he buyeth the mount Samaria from Shemer, with two talents of silver, and buildeth [on] the mount, and calleth the name of the city that he hath built by the name of Shemer, lord of the hill -- Samaria.
25 And Omri doth the evil thing in the eyes of Jehovah, and doth evil above all who [are] before him,
Young's Literal Translation is in the public domain.