Albert Barnes Commentary 2 Kings 10:19

"Now therefore call unto me all the prophets of Baal, all his worshippers, and all his priests; let none be wanting: for I have a great sacrifice [to do] to Baal; whosoever shall be wanting, he shall not live. But Jehu did it in subtlety, to the intent that he might destroy the worshippers of Baal." — 2 Kings 10:19 (ASV)

It appears from this verse that the “prophets” and “priests” of Baal were not identical. The former would correspond to the dervishes and the latter to the mullahs of Muslim countries. By the “servants” of Baal, the author means the ordinary worshipers.