Śatapatha Brāhmaṇa ("of a hundred paths") 1.7.2.23

1.7.2.23

te devā akāmayanta | kathaṃ nvimamapi saṃvṛñjīmahi yo 'yamasurāṇāmiti te 'rcantaḥ śrāmyantaścerusta etaṃ haviryajñaṃ dadṛśuryaddarśapūrṇamāsau tābhyāmayajanta tābhyāmiṣṭvaitamapi samavṛñjata

The gods were desirous as to how they might appropriate also the one that had fallen to the Asuras. They went on worshipping and toiling. They saw this haviryagña, to wit, the new- and full-moon sacrifices, and performed them; and by performing them they likewise appropriated the one--