Sayyiduna Ibn Abbas (may Allah be pleased with them both) recited this verse: "This day I have perfected for you your religion and completed My favour upon you" [Surah al-Ma'idah: 3] to the end of the verse. A Jew was present with him at the time, and he said: "If this verse had been revealed to us, we would have taken that day as a festival (Eid)." Ibn Abbas (may Allah be pleased with them both) said: "This verse was revealed on a day of two festivals: Friday and the Day of Arafah."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12780