Mughira bin Shu'bah reported that Allah's Apostle ( صلی اللہ علیہ وسلم ) worshipped so much that his feet were swollen. It was said to him: (Why do you undergo so much hardship despite the fact that Allah has pardoned for you your earlier and later sins? Thereupon he said: May I not (prove myself) to be a grateful servant (of Allah)?

This hadith has been transmitted on the authority of Mughira bin Shu'bah and the words are: Allah's Apostle ( صلی اللہ علیہ وسلم ) kept standing in prayer (for such long hours) that his feet were swollen. They (his Companions) said: Verily, Allah has pardoned for thee the earlier and the later of thine sins. Thereupon he said: Should I not prove myself to be a grateful servant (of Allah)?