四分律比丘含注戒本 2.507

2.507

Apart from the hands and feet, if one tickles with a staff, a whisk-handle, a key, or other objects, it is a duṣkṛta. There is no offence: if one does not do so intentionally; if someone is asleep and one touches him to awaken him; or while walking back and forth, or sweeping the ground, one mistakenly touches another with the tip of a staff—there is no offence.