Śatapatha Brāhmaṇa ("of a hundred paths") 3.9.2.16

3.9.2.16

guptyai vā etāḥ parihriyante | agniḥ purastādathaitāḥ samantam palyaṅgyante nāṣṭrā rakṣāṃsyapaghnatyastā āgnīdhre sādayati viśveṣāṃ devānām bhāgadheyī stheti tadāsu viśvāndevāntsaṃveśayatyete vai vasatāṃ varaṃ tasmādvasatīvaryo nāma vasatāṃ ha vai varam bhavati ya evametadveda

That (Vasatîvarî water) is carried round for the sake of protection; Agni is in front (of the sacrificial ground), and now that (water) moves about all round, repelling the evil spirits. He puts it down in the Âgnîdhra (fire-house) with, 'Ye are all the gods' share!' whereby he makes all the gods enter it. It is a desirable object (vara) to the dwellers (vasat), hence the name Vasatîvarî, and verily he who knows this, becomes a desirable object to the dwellers.