I have heard that on one occasion the Blessed One was staying near Sāvatthī at Jeta's Grove, Anāthapiṇḍika's monastery. Now on that occasion, in the pitch-black darkness of the night, the Blessed One was sitting in the open air while oil lamps were burning. And on that occasion, many flying insects, flying into & around those lamps, were meeting their downfall, meeting their misfortune, meeting their downfall & misfortune in those oil lamps. The Blessed One saw those flying insects, flying into & around those lamps, meeting their downfall, meeting their misfortune, meeting their downfall & misfortune in those oil lamps.

Then, on realizing the significance of that, the Blessed One on that occasion exclaimed: