Śatapatha Brāhmaṇa ("of a hundred paths") 3.7.3.4

3.7.3.4

te hocuḥ | na vā ime 'sya yāmaṃ viduryadagnau havirjuhvati naitām pratiṣṭhāmuparudhyaiva paśūnagnim mathitvāgnāvagniṃ juhavāma te vediṣyantyeṣa vai kila haviṣo yāma eṣā pratiṣṭhāgnau vai kila havirjuhvatīti tato 'bhyavaiṣyanti tato rātamanasa ālambhāya bhaviṣyantīti

They spake, 'Verily, these (animals) know not the manner of this, that it is in fire that sacrificial food is offered, nor (do they know) that secure resort (the fire): let us offer fire into the fire after securing the animals and churning the fire, and they will know that this truly is the manner of sacrificial food, this its resort; that it is truly in fire that sacrificial food is offered: and accordingly they will resign themselves, and will be favourably disposed to the slaughtering.'