Śatapatha Brāhmaṇa ("of a hundred paths") 7.4.2.10

7.4.2.10

atha dūrveṣṭakāmupadadhāti | paśavo vai dūrveṣṭakā paśūnevaitadupadadhāti tadyairado 'gniranantarhitaiḥ paśubhirupaitta ete tānevaitadupadadhāti tāmanantarhitāṃ svayamātṛṇāyā upadadhātīyaṃ vai svayamātṛṇānantarhitāṃstadasyai paśūndadhātyuttarāmuttarāṃstadasyai paśūndadhāti

He then lays the Darya-brick thereon;--the Dûrvâ-brick being cattle; it is with cattle he thus endows it: these are the same cattle together with which Agni on that former occasion approached; it is them he now puts thereon. He lays it down immediately on the naturally-perforated (brick); the naturally-perforated (brick) being this earth, he thus places the cattle immediately on this earth. Upon (the brick he places it): upon this earth he thereby places cattle.