折疑論 2.164

2.164

出家人。戒律有明文。不殺生草。而況於有情乎（律中云。昔有比丘。被賊劫奪。衣物悉盡。賊知佛子愛護生草守戒不殺。恐後逐。將比丘繫於草上。其僧竟日不敢動移。後遇其人。釋而去之生草尚爾。何況於有情者乎）。

For renouncers, the vinaya rules state clearly that one must not kill living grass, how much less so sentient beings! (In the vinaya it says: 'Once there was a monk who was robbed by bandits, and all his robes and belongings were taken. Knowing that the Buddha's disciples cherish living grass and uphold the precept not to kill it, the bandits feared he would pursue them later, so they tied the monk to the grass. That monk did not dare move for the entire day. Later he met someone who released him and he left.' If this is so even for living grass, how much more so for sentient beings?)