Making a will for leading the Janazah prayer.
If a person dies after making a will to his heirs that a specific person should lead his Janazah (funeral) prayer, then it is not obligatory upon his heirs to fulfill this will. However, if the heirs of the deceased wish to have that specific person lead the prayer, then there is no harm in it. (Aham Masail / Vol: 9 / Pg: 110)