فَعَسَى اللَّهُ أَنْ يَأْتِيَ بِالْفَتْحِ أَوْ أَمْرٍ مِنْ عِنْدِهِ
It may be that God will bring victory or another matter from Himself. (al-Māʾidah 5:52)
The construction uses ʿasā with an yaʾtiya. The imperfect verb yaʾtiya is subjunctive (manṣūb) because of an. The expression presents a future development as an object of hope.
Unlike “if only youth would return,” it concerns an outcome whose occurrence is regarded as possible.