~ 
Orthodox UnionWhy don’t we fulfill zechirah, remembering what Amalek did, on purim itself; why does it have to come first and why specifically on shabbos? Why did Esther insist that her book be canonized as part of Tanach?
Moshe and Yehoshua: Bridging the Amalek Gap – The Interdependence of Shabbos Zachor and Purim
March 9, 2017