2 Kings 23:5

He put down the idolatrous priests כמרים, chemarim. Their particular business, as appears from this place, was to burn incense. Hence it is thought by some, that the faithful Jews gave them this name by way of contempt, as being continually scorched by their fumigating fires. But, according to Bishop Patrick, they were so called from being clothed in black: for the Egyptians, as well as many other pagan nations; made use of black garments when they sacrificed to the infernal deities: in opposition to which the Jewish priests were clothed with white at their sacrifices.