Kauthumagrihyasutra 16

Now, he should tell the attendant about the gift of cows. The preceptor, having sat down in his own place, likewise the brahmin priest between the Brahmā and the fire, and the young boy, facing north on darbha grass, following after the preceptor and sitting touching his right knee; the preceptor having tied the girdle wrapped thrice, having caused the young boy to recite the mantra: “This […] from evil speech…”; the preceptor, having sipped water again, then the young boy, becoming bright-winged and radiant in the auspicious hour, during the initiation rite mutual [...], the preceptor sitting [and] that young boy sitting, then having completed the offering of oblations (upariṣṭāddhoma), then the imparting of the Sāvitrī verse: reciting the praṇava with the middle [tones], then pausing at each quarter-verse, likewise pausing at the second, the principal [quarter] at the third; then having him insert the mystic utterances preceded by the praṇava individually, loudly uttering “Oṃ”; then he should give a staff of palāśa wood; the preceptor having muttered: “O glorious one, me glorious…”; causing the young boy to receive it with: “To the glorious one, make me glorious…”; then he should take two kindling sticks in his right hand. It becomes righteous; it becomes righteous.

KauthGS 17: