四分律比丘含注戒本 1.188

1.188

有虎、狼、師子諸獸者，下至蟻子。若不為此諸蟲獸所惱，應治平地。若有石、樹、株杌、荊棘，使人掘出。若有坑、溝、渠、陂池，當使填滿。若畏水淹漬，當豫設堤防。若地為人所認，當共斷，當無使他有語。是謂難處也。

‘Dangers’ refers to tigers, wolves, lions, and other wild beasts, down to ants. If it is not troubled by these various creatures and beasts, he should level the ground. If there are stones, trees, stumps, or briars, he should have people dig them out. If there are pits, ditches, channels, or ponds, he should have them filled. If there is fear of flooding and soaking, he should set up embankments in advance. If the land is claimed by others, they should settle it together so that there are no disputes from others. This is called a place of danger.