Śatapatha Brāhmaṇa ("of a hundred paths") 5.4.3.10

5.4.3.10

atha dhanurārtnyā gāmupaspṛśati | samindriyeṇetīndriyaṃ vai vīryaṃ gāva indriyamevaitadvīryamātmandhatte 'thāha jināmīmāḥ kurva imā iti

He then touches a cow with the end of the bow, with, 'Together with energy!'--energy means vigour, kine: it is energy, vigour, he thereby takes to himself. And he adds, 'I overpower them, I seize them!'