there is a verse in your Book; had it been sent down to us, the community of Jews, we would have taken this day as a festival

A man from among the Jews came to the Commander of the Believers, ‘Umar ibn al-Khattāb (may Allah be pleased with him), and said: There is a verse in your Book—the Qur’an—which you recite. If it had been revealed to us, the Jews, in our Book, the Torah, we would have taken that day as a festival, celebrating it in gratitude for the blessing of such a great verse. ‘Umar (may Allah be pleased with him) asked: Which verse is that?

He said: {Today I have perfected your religion for you, completed My favor upon you, and have chosen Islam as your religion.} ‘Umar (may Allah be pleased with him) replied: We know well the day and the place in which this noble verse was revealed. It was sent down on a day of celebration—on Friday—while the Prophet (ﷺ) was standing at ‘Arafah. Both are great days for the Muslims.