Shatapatha Brahmana 2.6.1.21

2.6.1.21

athedhmamabhyādadhadāha | agnaye samidhyamānāyānubrūhīti sa ekāmeva hotā sāmidhenīṃ triranvāha sakṛdu hyeva parāñcaḥ pitarastasmādekāṃ hotā sāmidhenīṃ triranvāha

While putting firewood (on the fire), he then says (to the Hotri), 'Recite to the fire, as it is being kindled!' Only (this) one kindling-verse the Hotri recites, (and that) thrice;--the fathers have departed once for all: hence the Hotri recites thrice only one kindling-verse.