So I have heard. At one time the Buddha was staying near Sāvatthī in Jeta’s Grove, Anāthapiṇḍika’s monastery.

Then, late at night, the glorious god Kassapa, lighting up the entire Jeta’s Grove, went up to the Buddha, bowed, stood to one side, and said to him, “The Buddha has revealed the mendicant, but not his instructions to a mendicant.”

“Well then, Kassapa, clarify this matter yourself.”

“They should train in following good advice,
in attending closely to ascetics,
in sitting alone in hidden places,
and in calming the mind.”

That’s what the god Kassapa said, and the teacher approved. Then Kassapa, knowing that the teacher approved, bowed and respectfully circled the Buddha, keeping him on his right, before vanishing right there.