四分律比丘含注戒本 2.541

2.541

不犯者：若知彼物，相體而舉；若在露地風雨漂漬，舉之；若物主慢藏，衣物狼藉，為誡勅故藏之；若借他衣，而彼不收攝，恐失故舉之；或以此衣鉢諸物故，有命、梵等難故藏——一切無犯也。

There is no offence: if, knowing that article, one takes it away [for safekeeping] based on its nature; if it is in the open and soaked by wind and rain, and one takes it away; if the owner carelessly leaves it lying around in disorder, and one hides it in order to admonish him; if one borrows another's robe and that person does not put it away, and one takes it away out of fear that it may be lost; or if, on account of these robes, bowls, and other items, there are dangers to life or to the holy life, and one therefore hides them—in all such cases there is no offence.