IbnAbbas (Allah be pleased with both of them) reported that the Messenger of Allah ﷺ arrived in Madinah and found the Jews observing fast on the day of Ashura. The Messenger of Allah ﷺ said to them: What is the (significance) of this day that you observe fast on it? They said: It is the day of great (significance) when Allah delivered Moses (علیہ السلام) and his people, and drowned the Pharaoh and his people, and Moses (علیہ السلام) observed fast out of gratitude and we also observe it. Upon this the Messenger of Allah ﷺ said: We have more right, and we have a closer connection with Moses (علیہ السلام) than you have; so Allahs Messenger ﷺ observed fast (on the day of Ashura), and gave orders that it should be observed.