This podcast series is based on the book Arba‘īnīyyāt written by Sayyid Aḥmad Zanjānī (d. 1973). The book belongs to the genre of “forty-ḥadīth” literature and is on the topic of spiritual purification. Unlike most forty-ḥadīth works which only compile forty traditions on any given theme, Sayyid Aḥmad instead builds 4 unique chains of forty ḥadīth, where each ḥadīth is a preliminary for the next ḥadīth, using the following tradition as his basis: Imam Baqir (a) says: Allah (swt) sent revelation to Adam (a) saying: I have collected all goodness in four words; one of them is for me, one of...