What Is Istehsan?
Istehsan means taking into account the benefit and welfare of the people while prohibiting a thing in the case of Sadd e zarya. An example is of the lost husband case. The hanafid scholars are of the opinion that a woman has to wait till 90 years for her husband to return. After 90 years her marriage can be declared void, considering her husband dead. This verdict was later changed for the ease the hardship for the woman.