Śatapatha Brāhmaṇa ("of a hundred paths") 10.3.3.4

10.3.3.4

vetthāgnimiti hovāca kimeva mā vidvānupodasada ityagniṃ vedeti kamagniṃ vettheti śrotramiti yastamagniṃ veda kiṃ sa bhavatīti śrotravānbhavatīti hovāca nainaṃ śrotraṃ jahātīti

'Thou knowest Agni,' he said; 'knowing what hast thou come to me?'--'Agni I know.'--'What Agni knowest thou?'--'The Ear.'--'What becomes of him who knows that Agni?'--'He becomes hearing,' he said; 'his ear does not fail him.'