Śatapatha Brāhmaṇa ("of a hundred paths") 1.3.2.17

1.3.2.17

sa gṛhṇāti | dhāṃ nāmāsi priyaṃ devānāmityetadvai devānām priyatamaṃ dhāma yadājyaṃ tasmādāha dhāma nāmāsi priyaṃ devānāmityanādhṛṣṭaṃ devayajanamasīti vajro hyājyaṃ tasmādāhānādhṛṣṭaṃ devayajanamasīti

He takes (butter with the sruva), with the text (Vâg. S. I, 31), 'Verily, thou art the favourite resort (or, dainty) of the gods!' He thereby makes that butter the most favourite resort of the gods: for this reason he says, 'verily, thou art the favourite resort of the gods!'--'An unassailable means of worship!' the butter is indeed a thunderbolt: therefore he says, 'an unassailable means of worship!'