I’m sure this car and stabbing attack in Manchester, on Yom Kippur, happening two weeks after ISIS called for Muslims to “shoot, stab, and ram” Jews and Christians in Britain is just a coincidence. This hit on Yom Kippur, the holiest day in Judaism, when synagogues are packed from morning till night with people praying and fasting. This morning, October 2, worshippers gathered for Yom Kippur services at the Heaton Park Hebrew Congregation in Crumpsall, Manchester. This morning, October 2, worshippers gathered for Yom Kippur services at the Heaton Park Hebrew Congregation in Crumpsall, Manchester. The Significance of Yom KippurThis hit on Yom Kippur, the holiest day in Judaism, when synagogues are packed from morning till night with people praying and fasting.