緇門警訓 9.141

9.141

○常去左手第四指爪甲。莫令藏垢。釋氏要覽云。佛令比丘指甲止長一麥粒許。過則剪之。今有出家人愛護指爪養長寸餘。以為美觀。尚縱穢軀應無淨行。

Frequently trim the fingernail of the fourth finger of the left hand so that it does not harbor dirt. The Shishi yaolan states: "The Buddha instructed the bhikṣus that their fingernails should only be about the length of a grain of barley; if they exceed that, they must be trimmed." Nowadays there are renouncers who cherish their fingernails, growing them more than an inch long for the sake of appearance; if one still indulges this foul body, one surely lacks pure conduct.