Buddhist Dictionary of Pali Proper Names by G P Malalasekera
Papāta Sutta
Papāta Sutta:The Buddha once went with some monks to Patibhānakūta for the siesta,and a certain monk,seeing the precipice below them,asked if any precipice were deeper than that.Yes,answered the Buddha,the precipice of ignorance of the nature of dukkka.S.v.448f.