Narrated by 'Umar bin Al-Khattab
Once a Jew said to me, "O the chief of believers! There is a
verse in your Holy Book Which is read by all of you
(Muslims), and had it been revealed to us, we would have
taken that day (on which it was revealed as a day of
celebration." 'Umar bin Al-Khattab asked, "Which is that
verse?" The Jew replied, "This day I have perfected your
religion For you, completed My favor upon you, And have
chosen for you Islam as your religion." (5:3) 'Umar
replied,"No doubt, we know when and where this verse
was revealed to the Prophet. It was Friday and the Prophet
was standing at 'Arafat (i.e. the Day of Hajj)"

sahih bukhari Volume 1, Book 2, Number 43 :