Śatapatha Brāhmaṇa ("of a hundred paths") 1.7.2.17

1.7.2.17

sa vā aṅkhayannivaivānuvākyāmanubrūyāt | asau hyanuvākyā bṛhaddhyasau bārhataṃ hi tadrūpaṃ kṣipra eva yājyayā tvareteyaṃ hi yājyā rathantaraṃ hīyaṃ rāthantaraṃ hi tadrūpaṃ hvayati vā anuvākyayā prayacati yājyayā tasmādanuvākyāyai rūpaṃ huve havāmaha āgacedam barhiḥ sīdeti yaddhvayati hi tayā prayacati yājyayā tasmādyājyāyai rūpaṃ vīhi havirjuṣasva havirāvṛṣāya svāddhi piba preti yatpra hi tayā yacati

Let him pronounce the invitatory formula lingering, as it were: the invitatory formula, namely, is yonder (sky), and the brihat(-sâman) also is yonder (sky), since its form is that of the brihat. With the offering-formula let him, as it were, hurry on fast: the offering-formula, doubtless, is this (earth), and the rathantara(-sâman) also is this (earth), since its form is that of the rathantara. With the invitatory formula he calls (the gods), and with the offering-formula he presents (food to them): hence the invitatory formula (anuvâkyâ) has some such form as 'I call,' 'We call,' 'Come hither!' 'Sit on the barhis!' for with it he calls. With the offering-formula (yâgyâ) he offers: hence the offering-formula has some such form as, 'Accept the sacrificial food!' 'Relish the sacrificial food!' 'Accept the potation (âvrishâyasva)!' 'Eat! Drink! There!' for by it he offers that which (is indicated by) 'there!'