The Book of Arbaeen Arranged on the Seasons of Arbaeen is forty hadiths extracted from the hadiths of forty Hafiz, from the advanced Hafiz of Islam and the past Imams of the Shari'ah, who were deputed to speak and narrate, arranged in ten layers, from each era four of the trusted Hafiz, the second era being in the layer of those who took from the first era, and the third era in the layer of those who took from the second, and so on in succession and proximity.