The adverbial structure l-mafʿūl li-aj'lihi (المفعول لأجله) is known as the accusative of purpose. An indefinite noun in the accusative case manṣūb (منصوب) is used to specify the purpose, motive or reason behind an action. An example of the accusative of purpose can be found in verse (80:32):
and for your cattle.
(As) a provision
Fig 1. Accusative of purpose in verse (80:32).