Hiranyakeshigrihyasutra 2.1.5.2

2.1.5.2

āpūryamāṇapakṣe puṇye nakṣatregnimupasamādhāya vyāhṛtiparyantaṃ kṛtvā juhoti \ imaṃ me varuṇa \ tattvā yāmi \ tvaṃ no agne \ sa tvaṃ no agne \ tvamagne ayāsi \ prajāpate \ yadasya karmaṇotyarīricam \ iti ca atraike yajābhyātānānrāṣṭrabhṛta ityupajuhvati yathā purastāt \ brāhmaṇānannena pariviṣya puṇyāhaṃ svastyayanamṛddhimiti vācayitvāthainaṃ dadhi madhu ghṛtamiti trivṛtprāśayati \ bhūstvayi dadhāmi bhuvastvayi dadhāmi suvastvayi dadhāmi \ iti \2\

In the fortnight of the increasing moon, under an auspicious constellation, he puts wood on the fire, performs the rites down to the Vyâhriti oblations, and sacrifices (with the Mantras), 'This, O Varuna' (&c.; see I, chap. 27, Sûtra 2, down to): 'Hail! Good luck!' Then he gives (to the child) threefold food to eat, curds, honey, and ghee, with (the formula), 'Bhûh I lay into thee! Bhuvah I lay into thee! Suvah I lay into thee!'