瑜伽論記 3.90

3.90

欲界三十六處等者，如前第四卷說，黑勝生者，姓業惡名黑，是人趣故名勝，或黑中之極故名黑勝。旃荼羅者，屠兒也。卜羯婆者，亦云補羯婆，除糞穢家也。非黑非白勝生者，則吠舍等。

Regarding 'the thirty-six places of the desire realm' and so on, as explained previously in Fascicle 4: 'Dark and superior births'—the family line and karma are evil, hence called 'dark'; being of the human destiny, it is called 'superior'; or it is called 'dark and superior' because it is the extreme among the dark. A caṇḍāla is a butcher. A pukkasa, also called bokkasa, is a family of scavengers of excrement and filth. 'Births that are neither dark nor white yet superior' refers to vaiśyas and the like.