Gobhilagrihyasutra 2.6.9

2.6.9

dṛṣadaṃ prakṣālya brahmacārī vratavatī vā, brahmabandhuḥ kumārī vā 'pratyāharantī pinaṣṭi.

Having washed a nether mill-stone, a student or a (wife) addicted (to her husband), a person who is a Brâhmana by birth (only and not by learning), or a girl, pounds (that Nyagrodha shoot) without moving backward (the stone with which she pounds it).