四分律比丘含注戒本 2.724

2.724

If he slaps him with both hands, he commits a fallen offense (prāyaścittika). If he jabs him with a door-key or the like, it is in all cases a duṣkṛta. Bhikṣuṇīs commit the same offense as bhikṣus. As for non-offenses: if there is a reason that requires raising a hand to ward off, beckon, or touch [someone].