四分律比丘含注戒本 2.97

2.97

If, perceiving it to be living, one cuts it oneself or instructs another to cut it, roasts it oneself, boils it oneself, or instructs someone to do so, all incur a downfall [prāyaścittika]; if doubt arises, it is a duṣkṛta. For the seven kinds of forms of grasses and trees, destroying them oneself or instructing another to destroy them is a downfall; if doubt or perception [of uncertainty] arises, it is a duṣkṛta. If one drives a peg into living grass or trees, or damages them with fire and the like, all incur a downfall. If one severs living grasses and trees for the most part, it is a downfall. Cutting what is half-dry and half-living, as well as failing to say "Take note of this, look at this," all are duṣkṛtas. Cases of non-offense: if one says, "Look at this, take note of this"; if cutting dry and withered grasses and trees; if dragging timber or dragging bamboo over living grasses and trees; straightening fences and screens; clearing away moat stones; taking cow dung; if living grass covers the path and one pushes it aside with a staff; if supporting them with tiles and stones and cutting or injuring the grass and trees [incidentally]; if clearing the earth of a walkway, sweeping the ground of a walkway, or pounding the ground with a staff and mistakenly pushing aside and breaking living grass—there is no offense.