Harrid, as a member of the Anti-Ori underground, a group trying to uncover the truth about their people's history, realized that his beliefs could one day claim his life, and was forced to pose as a loyal Ori follower. However, he secretly hid items predating the supposed creation of humans by the Ori, including two Ancient long-range communication stones, in his house until his group would one day have gathered enough evidence to convince even the most stubborn believer.
After Dr. Daniel Jackson and Vala Mal Doran used an Ancient long-range communication device, Jackson's consciousness became trapped in Harrid's body, confirming his beliefs that the stones he kept hidden were communication devices. However, in trying to return to his own body, Jackson alerted the The Administrator to Harrid's true loyalties.
Eventually, Jackson and Vala, still in the bodies of Harrid and Sallis, were put on the Ara in their village, and sentenced to be burned to death. However, both Jackson and Vala were able to return to their own bodies in time, leaving Harrid to be killed by the fire. (SG1: "Avalon, Part 2", "Origin")