Śatapatha Brāhmaṇa ("of a hundred paths") 2.1.4.6

2.1.4.6

tadu hovāca bhāllaveyaḥ | yathā vā anyatkariṣyantso 'nyatkuryādyathānyadvadiṣyantso 'nyadvadedyathānyena pathaiṣyantso 'nyena pratipadyetaivaṃ tadya etaṃ cātuṣprāśyamodanam pacedaparāddhireva seti na hi tadavakalpate yasminnagnāvṛcā vā sāmnā vā yajuṣā vā samidhaṃ vābhyādadhyādāhutiṃ vā juhuyādyattaṃ dakṣiṇā vā hareyuranu vā gamayeyurdakṣiṇā vā hyenaṃ harantyanvāhāryapacano bhaviṣyatītyanu vā gamayanti

And on this point Bhâllabeya remarked, 'If he were to cook that rice-pap, this would assuredly be a mistake, just as if one were to do one thing, while intending to do another; or if one were to say one thing, while intending to say another; or if one were to go one way, while intending to go another.' And, indeed, it is not proper that they should either carry to the south, or extinguish, that fire on which a kindling-stick is put, or an oblation made, with a rik or a sâman or a yagus. Now they do indeed either take it to the south with the view of its becoming the Anvâhâryapakana (or Dakshinâgni), or (if there is to be no Dakshinâgni) they extinguish it.