Śatapatha Brāhmaṇa ("of a hundred paths") 13.4.4.3

13.4.4.3

aharaharvāci visṛṣṭāyām agnīṣomīyāṇāmantataḥ saṃsthāyām parihṛtāsu vasatīvarīṣu tadyadenaṃ devaiḥ saṃgāyanti devairevainaṃ tatsalokaṃ kurvanti

Day by day, after speech has been released, when, on the completion of the Agnîshomîya (animal sacrifices), the Vasatîvarî (water) has been carried round (the sacrificial ground). The reason why they thus sing of him along with the gods is that they thereby make him share the same world with the gods.