The Compendium of Caraka 4.8.5

4.8.5

tataḥ puṣpāt prabhṛti trirātramāsīta(?) brahmacāriṇyadhaḥśāyinī, pāṇibhyāmannamajarjarapātrādbhuñjānā, na ca kāñcinmṛjāmāpadyeta /

Then, from the onset of menstruation, she should remain for three nights observing celibacy, sleeping on the ground, eating food with her hands from an unbroken vessel, and not undergoing any cleansing.