Priests are Jaffa who take care of the young symbiotes of the Goa'uld. They help with implanting a symbiote in a new Jaffa and are often tasked with executing Jaffa as well by removing their symbiotes. (SG1: "Children of the Gods", "Bloodlines", "Within the Serpent's Grasp")
One of their more sacred rites was the Kadra'mal. (RPG: "Fantastic Frontiers: Stargate Season One")