The Book of Commentary (Kitab Al-Tafsir)

Muslim :: Book 43 : Hadith 7155

Tariq b. Shihab reported that a Jew came to 'Umar and said: Commander of the Faithful, there is a verse in your Book, which you recite. Had it been revealed in connection with the Jews, we would have taken it as the day of rejoicing. Thereupon he said: Which verse do you mean? He replied:" This day I have perfected your religion for you and I have completed My favours upon you and I have chosen al-Islam as religion for you." Umar said, I know the day when it was revealed and the place where it was revealed. It was revealed to Allah's Messenger (may peace be upon him) at 'Arafat on Friday.

Source materials are from the University of Southern California MSA site
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