Digha Nikaya 4 (dn4:10.4)

‘na kho esa, brāhmaṇa, pañho evaṁ pucchitabbo, evaṁ nāmesa, brāhmaṇa, pañho pucchitabbo’ti, tena maṁ ayaṁ parisā paribhaveyya: