The villagers of Ver Isca prostrating

Prostration is the ceremony of worshiping in Origin. The gathered humans will kneel face down, while one individual (usually a Prior or a village Administrator) will usually chant verses proclaiming the greatness of the Ori. It is traditional to bring a copy of the Book of Origin. Prostration can last up to six hours. This is the way in which the Ori take power from their human followers. (SG1: "Avalon, Part 2", "Crusade")