Arousing the Intellects with an explanation of Umdatul-Ahkaam (the book of Janaa'iz)

Al-Janaa’iz is the plural of Janazah which is the deceased. It is said that
Janazah is the deceased and Jinazah is the stretcher he is carried on, so the
first is higher and the second is lower. What's intended by the “book of al-
janaa’iz” is the book (or chapter) that mentions in it the rulings concerning
the dead: from the washing of the body, the wrapping of the body, the
prayer for the dead person, the carrying of the body and the burying of the
body. It is mentioned after the Book of the Prayer because the prayer for
the dead person is the most significant thing that is performed on his
behalf and the most beneficial matter for him, so on the authority of Ibn
Abbas (radi Allâh anhu) that he said:
“I heard the Prophet (sallallahu alayhi wa sallam) say: 'There is not a
muslim man, who dies and then 40 people, who do not associate any
partners with Allah, perform his janazah except that Allah will accept
their intercession on his (i.e. The deceased) behalf”