四分律行事鈔資持記 2.747

2.747

列緣。第四，據戒本中共有四分，黑毛二分，白毛尨毛各一分，尨謂麁毛也，增黑一兩提，增白二兩吉，增尨不犯。疏問黑白同犯，何故前黑不制參耶？答：兩戒明參，文則繁複；以後例前，黑參非犯。又問：三毛俱參，何以黑多尨少？答：就白制戒，故黑多耳；約前黑戒，白亦須多。又云：黑色雖貴，順法衣相；白是俗服，是以少也。

Listing the conditions: The fourth, based on the prātimokṣa, has four parts in total: two parts of black wool, one part each of white wool and coarse wool—"mang" means coarse wool. Adding one ounce of black incurs a pāyattika; adding two ounces of white incurs a duṣkṛta; adding coarse hair is not an offense. The Commentary asks: "Since black and white are both offenses, why did the previous black [precept] not prohibit mixing?" Answer: "If both precepts clarified mixing, the text would be redundant; by using the latter to model the former, mixed black is not an offense." It also asks: "When all three wools are mixed, why is black more and coarse less?" Answer: "The precept was instituted with respect to white, hence black is more; regarding the previous black precept, white must also be more." It also says: "Although black color is expensive, it accords with the mark of Dharma robes; white is secular clothing, and is therefore less."