Śatapatha Brāhmaṇa ("of a hundred paths") 2.1.4.4

2.1.4.4

atha cātuṣprāśyamodanam pacanti | candāṃsyanena prīṇīma iti yathā yena vāhanena syantsyantsyāttatsuhitaṃ kartavai brūyādevametaditi vadantastadu tathā na kuryādyadvā asya brāhmaṇāḥ kule vasantyṛtvijaścānṛtvijaśca tenaiva taṃ kāmamāpnoti tasmādu tannādriyeta

They then cook a rice-pap sufficient for (the) four (priests) to eat, 'Hereby we gratify the metres,' so they say, arguing that this is done in the same way as if one were to order a team, which he is going to use for driving, to be well fed. He need not, however, do this: for indeed that same wish (which he entertains in so doing) he obtains by the very fact that Brahmans, be they sacrificial priests or not, are residing in his family (kula): he need, therefore, take no notice of that (practice).