إِنْ كُنْتَ لَا تَدْرِي كَمْ صَلَّيْتَ وَ لَمْ يَقَعْ وَهْمُكَ عَلَى شَيْءٍ فَأَعِدِ الصَّلَاةَ.
“Abu al-Hassan (a.s.), has said, ‘If you do not know how many Rak‘at you have performed and your guess does not settle anywhere, perform your Salah (prayer) again.’”