Shatapatha Brahmana 11.7.2.6

11.7.2.6

tadāhuḥ adhvaryo yaddīkṣitasya nānavabhṛtho'vakalpate kvainamadidīkṣa ityāvabhṛthādanūddṛṃheyuradhvaryuśca pratiprasthātā ca hotā ca maitrāvaruṇaśca brahmā cāgnīdhraścaitairvā eṣa ṣaḍḍhotā tamanudrutya ṣaḍḍhotāraṃ juhotyekāmāhutiṃ kṛtvā pañca vājyā dyauṣpṛṣṭhamantarikṣamātmāṅgairyajñam pṛthivīṃ śarīraiḥ vācaspate'cidrayā vācācidrayā juhvā divi devāvṛdhaṃ hotrāmairayatsvāheti saiva dīkṣā

Here now they say, 'Seeing that the want of the purificatory bath in the case of the initiated is improper, Adhvaryu, when didst thou initiate him?' Well, let them sustain him till the purificatory bath,--to wit, the Adhvaryu, the Pratiprasthâtri, the Hotri, the Maitrâvaruna, the Brahman, and the Âgnîdhra, for it is through these that this (formula) is called 'shaddhotri ': having rapidly muttered that 'shaddhotri,' he offers, performing either one or five oblations of ghee,--'The heaven is his back, the air his body, O Vâkaspati, by his limbs he gave rise to the sacrifice, by his forms to the earth; by his flawless voice and his flawless tongue to the god-gladdening invocation, Hail!' This, indeed, is his initiation.