法苑珠林 99.36

99.36

又僧祇律云。比丘晨起應淨洗手。不得麁洗五指。復不得齊至腋。當齊手腕以前令淨。不得粗魯洗不得揩令血出。當以巨摩草末若灰土（澡豆皂莢）洗手。揩令作聲。淨洗手已更相揩者。便名不淨。應更洗手。比丘食前當護手。若摩頭捉衣。等更須洗（比丘尚爾白衣亦然）讀經受食等准用行之手淨尚爾。何況手殺生命飲血噉肉以污身口。縱欲傳法心亦不淨。

The Mahāsāṃghika-vinaya also says: "When monks rise in the morning, they should wash their hands thoroughly clean. They must not merely wash the five fingers cursorily, nor must they wash all the way up to the armpits; they should wash cleanly up to the wrists. They must not wash roughly, nor rub so hard as to cause bleeding. They should wash their hands with pulverized juma grass or ash and earth (or bath powder and soap-pods), rubbing until it makes a sound. If, after washing the hands clean, one rubs them together again, it is termed impure, and one should wash the hands again. Before eating, a monk must guard his hands. If he touches his head or grasps his robes, he must wash them again. (If this is so for monks, it is likewise for laypeople.) The same standard applies when reading sūtras, receiving food, and the like. If hand cleanliness is treated with such care, how much more so for those who kill living beings with their hands, drinking blood and devouring flesh to defile their body and mouth! Even if they wish to transmit the Dharma, their minds will likewise not be pure."