The story about Zimri’s secret plans and the other things that Zimri did are written in the book The History of the Kings of Israel. And the things that happened when Zimri turned against King Elah are also written in that book.
He did all the same sins that Jeroboam son of Nebat did. Jeroboam caused the people of Israel to sin. So they made the Lord, the God of Israel, very angry. The Lord was angry because they worshiped worthless idols.