Śatapatha Brāhmaṇa ("of a hundred paths") 9.2.3.3

9.2.3.3

te devā indramabruvan | tvaṃ vai naḥ śreṣṭho baliṣṭho vīryavattamo 'si tvamimāni rakṣāṃsi pratiyatasveti tasya vai me brahma dvitīyamastviti tatheti tasmai vai bṛhaspatiṃ dvitīyamakurvanbrahma vai bṛhaspatista indreṇa caiva bṛhaspatinā ca dakṣiṇato 'surānrakṣāṃsi nāṣṭrā apahatyābhaye nāṣṭra etaṃ yajñamatanvata

The gods said to Indra, 'Thou art the highest and mightiest, and strongest of us: do thou hold those fiends in check!'--'Let the Brahman (n.) be my ally!' he said.--'So be it!' They made Brihaspati his ally, for Brihaspati is the Brahman (the priesthood); and having had the Asuras, the mischievous fiends, chased away in the south by Brihaspati and Indra, they spread this sacrifice in a place free from danger and devilry.