Śatapatha Brāhmaṇa ("of a hundred paths") 1.5.2.15

1.5.2.15

sa yaddha so 'pavyāharet | yaṃ yajña upāvartate yathā pūrṇapātram parāsiñcedevaṃ ha sa yajamānam parāsiñcetsa yatra haivamṛtvijaḥ saṃvidānā yajñena caranti sarvameva tatra kalpate na muhyati tasmādevameva yajño bhartavyaḥ

If he whom the sacrifice approaches were to utter anything improper, he would waste the sacrifice, even as he might waste (water by spilling from) a full vessel. And where the officiating priests thus practice sacrifice with a perfect mutual understanding between them, there everything works regularly and no hitch occurs: therefore it is in this way that the sacrifice must be nursed.