John Gill Commentary 1 Kings 16:30

"And Ahab the son of Omri did that which was evil in the sight of Jehovah above all that were before him." — 1 Kings 16:30 (ASV)

And Ahab the son of Omri did evil in the sight of the Lord, above all that were before him . ] Adding other idols to the calves, and those more abominable than they; since the other kings pretended to worship God in them, but he worshipped other gods besides him, as the following verses show.