Shatapatha Brahmana 3.1.1.12

3.1.1.12

yadvāha | yatra devāso ajuṣanta viśva iti tadasya viśvairdevairjuṣṭam bhavatyṛkṣāmābhyāṃ saṃtaranto yajurbhirityṛkṣāmābhyāṃ vai yajurbhiryajñasyodṛcaṃ gacanti yajñasyodṛcaṃ gacānītyevaitadāha rāyaspoṣeṇa samiṣā mademeti bhūmā vai rāyaspoṣaḥ śrīrvai bhūmāśiṣamevaitadāśāste samiṣā mademetīṣam madatīti vai tamāhuryaḥ śriyamaśnute yaḥ paramatāṃ gacati tasmādāha samiṣā mademeti

And when he says, 'Wherein all the gods delighted,' thereby it becomes acceptable for him to all the gods. Crossing over by means of the rik and sâman, and by the yagus;' by means of the rik and sâman, and the yagus, indeed, they reach the end of the sacrifice: 'May I reach the end of the sacrifice!' he thereby says. 'May we rejoice in increase of substance and in sap!' Increase of substance doubtless means abundance, and abundance means prosperity: he. thereby invokes a blessing. 'May we rejoice in sap,' he says, because people say of one who enjoys prosperity and attains to the highest distinction, that 'he rejoices in sap;' therefore he says, 'May we rejoice in sap!'