Sahih Bukhari

Narrated Tariq bin Shihab:Some Jews said, ""Had this Verse been revealed to us, we would have taken that day as `Id (festival)."" `Umar said, ""What Verse?"" They said:-- ""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 said, ""I know the place where it was revealed; It was revealed while Allah's Messenger (ﷺ) was staying at `Arafat