In principle, the Supreme Court must refer the reversed decision to the trial court for a new decision, because the role of the Supreme Court is to make a final determination on questions of law and not to hear a case. That being said, there is a recent tendency according to which the Supreme Court acts as a second or third degree court, competent to decide reviewed cases without referring to the trial court.
Quandil, Prof. Mostafa El-Metwally
"Towards a new role of the Supreme Court as a Degree of Litigation "The Supreme Court as Second or Third Degree of Litigation" "A Comparative Study" - Part (I),"
UAEU Law Journal: Vol. 2015:
61, Article 3.
Available at: https://scholarworks.uaeu.ac.ae/sharia_and_law/vol2015/iss61/3