俱舍論疏 14.155

14.155

論「謂約能持至說能學言」，有部通經。言「一分等」者，先已具得五戒，後持一分、少分、多分、滿分不同，故分為四。若不爾者，不應言學一分等，應言受一分等。《婆沙》一百廿三云「答：此說持位，非說受位。謂於五中，持一不持四名一分，持二不持三名少分，持三持四名多分，具持五名滿。」

On the Śāstra's phrase: "It speaks in terms of ability to observe ... up to ... says 'capable of training':" The Sarvāstivāda harmonizes this with the sūtras. When speaking of "one part, etc.," it means that previously one has already completely obtained the five precepts, and later whether one observes one part, a lesser part, a greater part, or the full part is different; hence they are divided into four. If it were not so, it should not say "training in one part, etc."; it should say "receiving one part, etc." The Vibhāṣā, fascicle 123, says: "Answer: This speaks of the stage of observing, not of the stage of receiving. That is to say, among the five, observing one and not observing four is called 'one part'; observing two and not observing three is called 'a lesser part'; observing three or four is called 'a greater part'; and completely observing all five is called 'full.'"