Śatapatha Brāhmaṇa ("of a hundred paths") 9.1.2.3

9.1.2.3

yadvevainam pariṣiñcati | ime vai lokā eṣo 'gnirimāṃstallokānadbhiḥ paritanoti samudreṇa haināṃstatparitanoti sarvatastasmādimāṃlokāntsarvataḥ samudraḥ paryeti dakṣiṇāvṛttasmādimāṃlokāndakṣiṇāvṛtsamudraḥ paryeti

And, again, as to why he sprinkles him,--that Agni (the fire-altar), doubtless, is these worlds: by water he thus encompasses these worlds, by the ocean, indeed, he encompasses them. On every side (he sprinkles the altar): hence the ocean flows round these worlds on every side. From left to right (he sprinkles): hence the ocean flows round these worlds from left to right.