四分律比丘含注戒本 2.169

2.169

若以草、土擲蟲水中，若蟲酪漿、清酪漿、若酢以澆泥、草，一切皆墮。教人亦同。

(if one throws grass or dirt into water containing living creatures, or uses buttermilk with creatures, clear buttermilk, or vinegar to pour onto mud or grass, in all cases it is a prāyaścittika. Telling another is also the same.)