Shatapatha Brahmana 10.1.5.1

10.1.5.1

sarve haite yajñā yo'yamagniścitaḥ sa yatpaśumālabhate tadagnyādheyamatha yadukhāṃ sambharati tānyagnyādheyahavīmṣyatha yaddīkṣate tadagnihotramatha yaddīkṣitaḥ samidhāvādadhāti te agnihotrāhutī

This built fire-altar, in truth, (includes) all these sacrifices:--when he slaughters an animal victim, that is the Agnyâdheya (establishment of the sacred fires); when he collects (the materials for) the fire-pan, that constitutes the oblations of the Agnyâdheya; when he performs the initiation, that is the Agnihotra; and when the initiated puts two logs on (the fire), these are the two oblations of the Agnihotra.