Agniveshyagrihyasutra 1.1.3B.45

1.1.3B.45

agnau pṛthivyāṃ pratitiṣṭha vāyāvantarikṣe sūrye divi yām̐ svastimagnirvāyurādityaścandramā āpo 'nusañcaranti tāṃ svastimanusañcarāsau prāṇasya brahmacāryabhūrasau ityubhayatrānuṣajati \

he subjoins in both [ears]: "Be firmly established in Agni and on earth, in Vāyu and in the atmosphere, in Sūrya and in heaven! Go along that well-being which Agni, Vāyu, Āditya, the moon, and the waters go along, O so-and-so! You have become a Vedic student of breath, O so-and-so!"