Śatapatha Brāhmaṇa ("of a hundred paths") 5.4.1.1

5.4.1.1

keśavasya puruṣasya | lohāyasamāsya āvidhyatyaveṣṭā dandaśūkā iti sarvānvā eṣa mṛtyūnatimucyate sarvānbadhānyo rājasūyena yajate tasya jaraiva mṛtyurbhavati tadyo mṛtyuryo badhastamevaitadatinayati yaddandaśūkān

He puts a piece of copper into the mouth of a long-haired man, with (Vâg. S. X, 10), 'Removed by sacrifice are the mordacious.' For verily he who performs the Râgasûya escapes all kinds of death, all murderous blows, and old age alone is his death: hence whatever kind of death, whatever murderous blow there is, past that he now guides him, as past the mordacious ones.