الكافي- ط الاسلامية, volume 2, page 258

26. Ali ibn Ibrahim has narrated from Harun ibn Muslim from Mas’adah ibn Sadaqa from Abu ‘Abdillah (a.s.) who has said the following: “The Messenger of Allah one day said to his companions, ‘Condemned is every property that is not purified by paying al- Zakat (charity), condemned is the body that is not purified once in every forty days.’ He was then asked, ‘O Messenger of Allah, we know how property is purified, but what is al-Zakat (purification) of the bodies?’ The Messenger of Allah said, ‘It is the suffering of the body from certain forms of trouble.’ The narrator has said that the faces of those who heard it changed and when he noticed the change in their faces he asked them, ‘Did you understand what I meant by what I just said?’ They said, ‘No, O Messenger of Allah.’ He then said, ‘What I meant was that a man suffers a scratch or a set back, a slip, or illness, or is pricked by a spike or such other things.’ In his Hadith he also mentioned even sourness in the eyes.”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

27. Abu Ali al-Ash’ari has narrated from Muhammad ibn ‘Abd al-Jabbar from ibn Faddal from ibn Bukayr who has said the following: “Once I asked Abu ‘Abdillah (a.s.) ‘Does a believer suffer from leprosy or similar diseases?’ The Imam asked, ‘Is misfortune written for anyone other than the believers?”’

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

28. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from his narrators, from al-Halabi from Abu ‘Abdillah (a.s.) who has said the following: “A believer is so important to Allah that if he asks Him paradise and all that is therein. He will give it to him without any shortages caused to His kingdom. The unbeliever is so insignificant before Allah that if he asks the whole world and all that is therein. He will give it to him without any shortages caused in His kingdom. Allah is committed to sending misfortune to the believers just like one’s commitment to his family in sending them souvenirs during his absence from home. He holds him back from worldly things like the physician who holds back a patient from certain food items.”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.