Sura Al-Māʾida | Vers 3: "...Today I have perfected your religion for you, and completed My favour on you, and I have chosen for you Islam as a religion..." Which day is 'today' - the day of the perfection of religion? The answer is: "The Day of Ghadeer Khumm." Sunnites and Shi'ites confirm it, and it completely fits with the contents of the verse. That day was the day when the Prophet of Islam (S) formally assigned Amir-ul-Mu'mineen Ali (as) as his successor.💚 من كنت مولاه فهذا على مولاه