Śatapatha Brāhmaṇa ("of a hundred paths") 6.3.2.4

6.3.2.4

athājam | yoge-yoge tavastaraṃ vāje-vāje havāmaha ityannaṃ vai vājaḥ karmaṇi-karmaṇi tavastaramanne 'nne havāmaha ityetatsakhāya indramūtaya itīndriyavantamūtaya ityetattadaje vīryaṃ dadhāti

Then the he-goat, with (Vâg. S. XI, 14), 'At every yoking, at every race, we call him, the most powerful,'--race means food: thus, 'in every performance, in respect of every food we call him, the most powerful;'--'Indra to our help, we his friends!'--that is, 'him, the strong (indriyavat), to our help:' he thereby lays vigour into the he-goat.