Abu Bakr ibn Abi Shaybah and Abu Kurayb narrated to us, both saying: Abu Usamah narrated to us, from al-Walid ibn Kathir, from Muhammad ibn 'Amr ibn 'Ata', from 'Ata' ibn Yasar, from Abu Sa'id and Abu Hurayrah, that they both heard the Messenger of Allah (peace and blessings of Allah be upon him) say: "No fatigue, nor illness, nor sickness, nor sorrow afflicts a believer — even worry that worries him — except that by it some of his sins are expiated."