Buddhist Dictionary of Pali Proper Names by G P Malalasekera
Paccorohanī Sutta
Paccorohanī Sutta:Jānussonī tells the Buddha how,on certain fast days,the brahmins perform a ceremony called paccorohanī,when they bathe and purify themselves and worship the fire three times during the night.He then asks the Buddha whether the Ariyans have a corresponding observance,and the Buddha answers him.A.v.233ff.