Adar 1 is also the yahrtzeit (anniversary of the passing) of the great Halachist Rabbi Shabtai Hakohen Katz (1621-1663?), author of the Siftei Cohen commentary on Rabbi Yosef Caro's Code of Jewish Law. He is known as "Shach" -- an acronym of the name of his work, which serves to this day as a primary source of Halachah (Jewish law).







