釋氏要覽 3.269

3.269

此律居常式也。此云共住又云淨住○毘奈耶云。裒洒陀唐言長養淨。謂除破戒垢長養清淨故。意令半月半月憶所犯事對無犯人說露異改前愆。一則遮現在之更為。二則懲未來之慢法故○毘尼母論云。何名布薩。答斷名布薩。謂能斷所作能斷煩惱斷一切不善法。故又云。清淨名布薩。

This is the regular rule for Vinaya residences. It is translated here as 'dwelling together,' and also as 'pure dwelling.' The Vinaya states: "Poṣadha is translated in the language of Tang as 'nourishing purity,' meaning removing the defilement of broken precepts and nourishing purity. The intention is to cause them, every half month, to recall the offenses they have committed, and confess and reveal them before those who have not committed offenses, altering their former transgressions. First, this prevents them from being done again in the present; second, it warns against future disregard of the Dharma." The Vinayamātṛkā-śāstra states: "Why is it called poṣadha? Answer: Severance is called poṣadha, meaning being able to sever deeds, being able to sever afflictions, and severing all unwholesome phenomena. Therefore, it is also said that purity is called poṣadha."