Gobhilagrihyasutra 3.3.2

3.3.2

vyāhṛtibhir hutvā śiṣyāṇāṃ sāvitryanuvacanaṃ yatho 'panayane,

After (the teacher) has sacrificed with the Vyâhritis, he recites the Sâvitrî to the students as at the Upanayana;