Question: Since it is forbidden to fast on Shabbat, do we fast on Yom Kippur if it falls on Shabbat? Answer: We do fast when Yom Kippur coincides with Shabbat (this being one of the differences between Yom Kippur and other fasts). Since Yom Kippur is a biblical fast, and the Torah calls it “Shabbat Shabbaton” – the Shabbat of Shabbats – this implies that it takes precedence over Shabbat.…