四分律刪繁補闕行事鈔 2.489

2.489

The Vinaya states: Eight matters cause the forfeiture of a night: first, going to another monastery without announcing; second, a visiting bhikṣu arriving and not announcing; third, leaving the boundary on one's own business without announcing; fourth, walking slowly within the monastery without announcing; fifth, being ill and not sending a messenger to announce; sixth, two or three persons sleeping together in one room; seventh, dwelling in a place where there are no bhikṣus; eighth, not announcing at the biweekly upoṣadha recitation. Whenever any one of these is missing, he forfeits one night (those already acquired are not lost, but the uncompleted ones do not count).