Sūcilomasutta
Evaṁ me sutaṁ— ekaṁ samayaṁ bhagavā gayāyaṁ viharati ṭaṅkitamañce sūcilomassa yakkhassa bhavane. Tena kho pana samayena kharo ca yakkho sūcilomo ca yakkho bhagavato avidūre atikkamanti. Atha kho kharo yakkho sūcilomaṁ yakkhaṁ etadavoca: “eso samaṇo”ti. “Neso samaṇo, samaṇako eso. Yāvāhaṁ jānāmi yadi vā so samaṇo, yadi vā so samaṇako”ti.
With Spiky
So I have heard. At one time the Buddha was staying near Gayā on the cut-stone ledge in the haunt of Spiky the native spirit. Now at that time the native spirits Shaggy and Spiky were passing by not far from the Buddha. So Shaggy said to Spiky, “That’s an ascetic.” “That’s no ascetic, he’s a faker! I’ll soon find out whether he’s an ascetic or a faker.”