question #1 Sahih Muslim 1130b, Book 13, Hadith 163 : What is the significance of fasting on the day of ‘Ashura in Islamic tradition?

This hadith has been narrated by Ibn Bishr with the same chain of transmitters (but with a slight variation) that he (the Holy Prophet) inquired of them (Jews) about it (fasting on the day of ‘Ashura).