Vayupurana 1.8.175

Vāyupurāṇa 1.8.175

daṇḍī ca mekhalī caiva hyadhaḥ śāyī tathā jaṭī.
guruśuśrūṣaṇaṃ bhaikṣaṃ vidyādvai brahmacāriṇaḥ ..174..