Śatapatha Brāhmaṇa ("of a hundred paths") 2.5.3.17

2.5.3.17

atha prātarhute vāhute vā | yatarathā kāmayeta so 'syā aniraśitāyai kumbhyai darvyopahanti pūrṇā darvi parāpata sapūrṇā punarāpata vasneva vikrīṇāvahā iṣamūrjaṃ śatakrataviti yathā puro 'nuvākyaivamepaitayaivainametasmai bhāgāya hvayati

Thereupon, in the morning, either after or before the performance of the Agnihotra--whichever he pleases--he cuts out (the remaining rice-pap) with the darvi-spoon from the un-emptied pot, with the text (Vâg. S. III, 49), 'Full, O spoon, fly away, well filled fly back to us! O thou (Indra), of a hundredfold powers, let us two barter food and drink, like wares!' In like manner as an invitatory prayer (is used at offerings) so does he by this (verse) invite him (Indra) to that share.