Śatapatha Brāhmaṇa ("of a hundred paths") 7.3.2.5

7.3.2.5

athāhāgnibhyaḥ prahriyamāṇebhyo 'nubrūhīti | etadvai devānupapraiṣyata etaṃ yajñaṃ taṃsyamānānrakṣāṃsi nāṣṭrā ajighāṃsanna yakṣyadhve na yajñaṃ taṃsyadhva iti tebhya etānagnīnetā iṣṭakā vajrānkṣurapavīnkṛtvā prāharaṃstairenānastṛṇvata tāntstṛtvābhaye 'nāṣṭrā eta yajñamatanvata

He (the Adhvaryu) then says (to the Hotri), 'Recite to the fires being led forward!' For at that time when the gods were setting out to spread the sacrifice, the Rakshas, the fiends, sought to smite them, saying, 'Ye shall not sacrifice! ye shall not spread the sacrifice!!' Having made those fires, those bricks, to be sharp-edged thunderbolts, they hurled these at them, and laid them low thereby; and having laid them low, they spread that sacrifice in a place free from danger and devilry.