諸經要集 20.77

20.77

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。

Furthermore, the Mahāsāṃghika-vinaya states: When a monk rises in the morning, he should wash his hands cleanly; he must not wash them roughly. The five fingers also must not reach up to the armpits; he should wash up to the wrists to make them clean, and must not be careless. In washing, he must not rub so hard as to cause bleeding. He should use powdered sesame, or ashes and earth (soap-powder and Chinese honeylocust), rubbing his hands until they make a sound. If, after washing his hands clean, he rubs them together again, it is called impure, and he should wash his hands again. Before eating, a monk should guard his hands; if he touches his head or holds his robes, he must wash them again (this applies to monks, and it is also so for laypeople). Reading sūtras, receiving food, and so forth should follow this practice. If this is so for hand purity, how much more so for killing living beings with one's hands, drinking blood, and eating meat, thereby defiling body and mouth? Even if one wishes to transmit the Dharma, one's mind will also be impure.