الْأَعْمَالُ بِالْخَوَاتِيمِ
Deeds are judged by their endings.
Good action, repentance, return to Allah, and steadfastness are required. One may recognize a good deed seen today, but cannot pronounce a certain judgment on the person’s ultimate destiny.
Likewise, seeing a sinner does not justify a categorical claim that divine mercy is forever closed to that person. Repentance, divine will, and grace remain relevant; the final ending is known to Allah.