Śatapatha Brāhmaṇa ("of a hundred paths") 1.5.2.16

1.5.2.16

tā vā etāḥ | pañca vyāhṛtayo bhavantyo śrāvayāstu śrauṣaḍyaja ye yajāmahe vauṣaḍiti pāṅkto yajñaḥ pāṅktaḥpaśuḥ pañcartavaḥ saṃvatsarasyaiṣaikā yajñasya mātraiṣā sampat

Now there are here five utterances, viz. (1) 'Bid (him, Agni, or them) hear!' (2) 'Yea, may he (or, one) hear!' (3) 'Pronounce the prayer to the kindling-sticks!' (4) 'We who pronounce the prayer...' (5) 'May he bear (the sacrifice to the gods)!' fivefold is the sacrifice, fivefold the animal victim, five are the seasons of the year: this is the one measure of the sacrifice, this its consummation.