So I have heard. At one time the Buddha was staying near Rājagaha in the Bamboo Grove, the squirrels’ feeding ground.
Now at that time Venerable Mark and Venerable Mahāmoggallāna were staying on the Vulture’s Peak Mountain. Then Mahāmoggallāna robed up in the morning and, taking his bowl and robe, went to Mark and said to him, “Come, Reverend Mark, let’s enter Rājagaha for alms.”
“Yes, reverend,” Mark replied.
As Mahāmoggallāna was descending from Vulture’s Peak Mountain he smiled at a certain spot. So Mark said to Mahāmoggallāna, “What is the cause, Reverend Moggallāna, what is the reason you smiled?”
“Reverend Mark, it’s the wrong time for this question. Ask me when we’re in the Buddha’s presence.”
Then Mark and Mahāmoggallāna wandered for alms in Rājagaha. After the meal, on their return from almsround, they went to the Buddha, bowed, and sat down to one side. Mark said to Mahāmoggallāna:
“Just now, as Mahāmoggallāna was descending from Vulture’s Peak Mountain he smiled at a certain spot. What is the cause, Reverend Moggallāna, what is the reason you smiled?”
“Just now, reverend, as I was descending from Vulture’s Peak Mountain I saw a skeleton flying through the air. Vultures, crows, and hawks kept chasing it, pecking, clawing, and stabbing it in the ribs as it screeched in pain. It occurred to me: ‘Oh lord, how incredible, how amazing! That there can be such a sentient being, such a spirit, such an incarnation!’”
Then the Buddha said to the mendicants:
“Mendicants, there are disciples who live full of vision and knowledge, since a disciple knows, sees, and witnesses such a thing.
Formerly, I too saw that being, but I did not speak of it. For if I had spoken of it others would not have believed me, which would be for their lasting harm and suffering.
That being used to be a cattle butcher right here in Rājagaha. As a result of that deed he burned in hell for many years, many hundreds, many thousands, many hundreds of thousands of years. Now he experiences the residual result of that deed in such an incarnation.”
(Tell all these discourses in full like this.)