Hiranyakeshigrihyasutra 1.2.6.10

1.2.6.10

ādityāyāñjaliṃ kṛtvācāryāyopasaṃgṛhya dakṣiṇataḥ kumāra upaviśya \ adhīhi bho \ ityuttkāthāha \ sāvitrīṃ bho anubrūhi \ iti \10\

The boy raises his joined hands towards the sun, embraces (the feet of) his teacher, sits down to the south (of the teacher), addresses (him), 'Recite, sir!' and then says, 'Recite the Sâvitrî, sir!'