Mahāli visits the Buddha at the Kūṭāgārasālā and questions him regarding the doctrine of Pūraṇa Kassapa that there is no cause or condition for the impurity of beings. The Buddha contradicts this view, and explains that it is because beings take delight in the body, etc., that they become impure. When they feel revulsion towards the body, etc., they become pure. S.iii.68 f.