Tariq bin Shihab reported that a Jew said toUmar (RA) : You recite a verse which, if it had been revealed in relation to us, we would have taken that day as the day of rejoicing. Thereupon Umar said: I know where it was revealed and on the day when it was revealed and where Allahs Messenger ﷺ had been at that time when it was revealed. It was revealed on the day of Arafa (ninth of Dhul Hijjah) and Allahs Messenger ﷺ had been staying in Arafat. Sufyan said: I doubt, whether it was Friday or not (and the verse referred to) is this: "Today I have perfected your religion for you and completed My favours upon you" (v. 4).