The early Isinays of Nueva Vizcaya were responsible for choosing the spouses of their children. This was called purung. The announcement of the betrothal was accompanied by a ritual wherein the guests would offer a prayer to the souls of the dead relatives of their host. After the prayers, food is served, and the announcement is revealed to everyone. The public announcement is done so that should the marriage not push through, the one who backed out shall shoulder all the purung’s expenses.
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Source:
Perez, Ma. Christina. Isinay. http://litera1no4.tripod.com/isinay_frame.html