Śatapatha Brāhmaṇa ("of a hundred paths") 3.7.1.10

3.7.1.10

atha sruveṇopahatyājyam | avaṭamabhijuhoti nedadhastānnāṣṭrā rakṣāṃsyupottiṣṭhāniti vajro vā ājyaṃ tadvajreṇaivaitannāṣṭrā rakṣāṃsyavabādhate tathādhastānnāṣṭrā rakṣāṃsi nopottiṣṭhantyatha purastātparītyodaṅṅāsīno yūpamanakti sa āha yūpāyājyamānāyānubrūhīti

Having then taken out ghee with the dipping-spoon, he offers it into the hole, 'lest the evil spirits should rise from below:' ghee is a thunderbolt, he thus repels the evil spirits by means of the thunderbolt, and thus the evil spirits do not rise from below. Having then gone round to the front, he sits down facing the north and anoints the stake. He says (to the Hotri), 'Recite to the stake as it is anointed!'