Śatapatha Brāhmaṇa ("of a hundred paths") 6.7.3.1

6.7.3.1

athainamiti pragṛhṇāti | etadvai devā akāmayanta parjanyo rūpaṃ syāmeti ta etenātmanā parjanyo rūpamabhavaṃstathaivaitadyajamāna etenātmanā parjanyo rūpam bhavati

He then holds it (the fire in the pan) up thus (towards north-east). Now the gods at that time were desiring, 'May we be like Parganya (the rain-god)!' By that body (of his) they became like Parganya, and in like manner does the Sacrificer by that body (of his) become like Parganya.