The House of Imran were a Zadokite priesthood opposed by the Sadduccee pseudo-Zadokite priesthood and forced through the Torah literalism of the Temple system to side with Beth Shammai though longing for a sign from heaven to validate the stance of Beth Hillel. Petrines believe the life and prophecies of Jesse ben Marym (whom they regard as a messiah) was the sign which nullified the legality of the 18 ordinances of the house of Shammai (Yerushalmi Berakhot, 1:7).
Petrines accept people as petists of the world's nations even if not living in the land of Israel under the Jubilee, but only through vows before ordination authorities estblished by apostolic successors.