Jarudapāna Jātaka (No.256)
The Bodhisatta was once travelling with a large caravan. In a wood they came
across a disused well and, needing water, dug it deeper. There they came across
buried treasure, but the men, not being satisfied, dug deeper, in spite of the
A Nāga-king who lived there was disturbed and slew all except the Bodhisatta.
The story was related in reference to some arahants of Sāvatthi, who, on
their way back from there, after having entertained the Buddha, saw the same
well and found treasure there. They, however, were satisfied with their find and
reported it to the Buddha (J.ii.294f).