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This hadith has been transmitted on the authority of Mughira b. Shu'ba and the words are: Allah's Apostle (may peace be upon him) 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)?