A-6.1

(Nawawi:) The third category is the supererogatory (def: c-4.2), such as in-depth research into the bases of evidences, and elaboration beyond the amount required by the communal obligation, or such as an ordinary Muslim learning the details of nonobligatory acts of worship for the purpose of performing them; though not the work of scholars in distinguishing the obligatory from the nonobligatory, which is a communal obligation in respect to them. And Allah knows best (ibid, 1.27).