Śatapatha Brāhmaṇa ("of a hundred paths") 5.4.3.12

5.4.3.12

tasmai tāvanmātrīrvā bhūyasīrvā pratidadāti | na vā eṣa krūrakarmaṇe bhavati yadyajamānaḥ krūramiva vā etatkaroti yadāha jināmīmāḥ kurva imā iti tatho hāsyaitadakrūraṃ kṛtam bhavati tasmāttāvanmātrīrvā bhūyasīrvā pratidadāti

In return he presents to him just as many (cows), or more. For assuredly he, the Sacrificer, is not capable of a cruel deed; but cruelly indeed he acts when he says, 'I overpower them, I seize them;' and thus that is done by him without cruelty: this is why, in return, he presents to him just as many (cows) or more.