Śatapatha Brāhmaṇa ("of a hundred paths") 4.4.3.11

4.4.3.11

tā na dadbhiḥ khādeyuḥ | paśavo vā ete netpaśūnpramrade karavāmahā iti prāṇaireva bhakṣayanti yaste aśvasanirbhakṣo yo gosanirita paśavo hyete tasmādāha yaste aśvasanirbhakṣo yo gosaniriti tasya ta iṣṭayajuṣa stutastomasyetīṣṭāni hi yajūṃṣi bhavanti stutā stomāḥ śastokthasyeti śastāni hyukthāni bhavantyupahūtasyopahūto bhakṣayāmītyupahūtasya hyetadupahūto bhakṣayati

They must not bite them with their teeth,--for these (grains) mean cattle,--thinking 'lest we should do aught to crush our cattle!' They only drink it in with their breath, with (Vâ,;. S. VIII, 12), 'What horse-winning, what cow-winning draught is thine;' for they are cattle: therefore he says, 'what horse-winning, what cow-winning draught is thine;'--'Of that draught, offered with Yagus, praised by chants,'--for Yagus-prayers have indeed been offered, and chants have been chanted;--'sung by hymns,'--for songs (sastras) have been sung;--'Of the invited do I drink, invited,'--for invited, he now drinks of the invited.