Udapānasutta
Evaṁ me sutaṁ— ekaṁ samayaṁ bhagavā mallesu cārikaṁ caramāno mahatā bhikkhusaṅghena saddhiṁ yena thūṇaṁ nāma mallānaṁ brāhmaṇagāmo tadavasari. Assosuṁ kho thūṇeyyakā brāhmaṇagahapatikā: “samaṇo khalu, bho, gotamo sakyaputto sakyakulā pabbajito mallesu cārikaṁ caramāno mahatā bhikkhusaṅghena saddhiṁ thūṇaṁ anuppatto”ti. (…) Udapānaṁ tiṇassa ca bhusassa ca yāva mukhato pūresuṁ: “mā te muṇḍakā samaṇakā pānīyaṁ apaṁsū”ti.
The Well
So I have heard. At one time the Buddha was wandering in the land of the Mallas together with a large Saṅgha of mendicants when he arrived at a brahmin town of the Mallas named Thūṇa. The brahmins and householders of Thūṇa heard: “It seems the ascetic Gotama—a Sakyan, gone forth from a Sakyan family—while wandering in the land of the Mallas has arrived at Thūṇa, together with a large Saṅgha of mendicants.” They filled the well with grass and hay right to the top, thinking, “Don’t let these shavelings, these fake ascetics drink the water.”