John Gill Bible Commentary

And Jehu sent through all Israel,.... Persons to proclaim this solemn assembly: and all the worshippers of Baal came, so that there was not a man left that came not; some no doubt came cheerfully, having no suspicion of him, and the rather, as he might have been a worshipper of Baal in the times of Ahab; and as for what he had done to Baal's priests, they might consider that only as they were in connection with Ahab's family, whom to destroy was his political interest; and they were glad at heart their new king was so affected to Baal, and fond to see such a grand solemnity as they expected this to be; and others that might be suspicious of him, yet as they must die if they did not appear, and there was a possibility they might live, chose therefore to come: and they came into the house of Baal; the temple which Ahab had built for him in Samaria, Kg1 16:32. and the house of Baal was full from one end to the other; not only the body of the temple, but all the outward court, every mouth, or corner, as in the original text: and this single house might be sufficient for all in the land; since the number of them might be greatly lessened by the ministry of Elijah and Elisha, as well as by the destruction the former made of the prophets of Baal; and by the schools of the prophets set up in various places, from whence prophets were sent out to instruct the people; and by Joram's putting away the image of Baal, which no doubt lessened the number of his worshippers.