Hiranyakeshigrihyasutra 1.2.5.8

1.2.5.8

athāsya dakṣiṇena hastena dakṣiṇamaṃsamanvārabhya savyena savyaṃ vyāhṛtibhiḥ sāvitryeti dakṣiṇaṃ bāhumabhyātmannupanayate \ devasya tvā savituḥ prasaveśvinorbāhubhyāṃ pūṣṇo hastābhyāmupanayesau \ iti ca \8\

Then (the teacher) touches with his right hand (the boy's) right shoulder, and with his left (hand) his left (shoulder), and draws (the boy's) right arm towards himself with the Vyâhritis, the Sâvitrî verse, and with (the formula), 'By the impulse of the god Savitri, with the arms of the two Asvins, with Pûshan's hands I initiate thee, N.N.!'