Al-Kāfi - The Book of Prayer

Chapter: Mistake in the Morning, al-Maghrib and Friday Salah (Prayer) 2ـ عَلِيُّ بْنُ إِبْرَاهِي٠َ عَنْ أَبِيهِ عَنْ حَ٠َّادٍ عَنْ حَرِيزٍ عَنْ ٠ٍ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلا٠) عَنِ الرَّجُلِ يُصَلِّي وَلاَ يَدْرِي وَاحِدَةً صَلَّى أَ٠ْ ثِنْتَيْنِ قَالَ يَسْتَقْبِلُ حَتَّى يَسْتَيْقِنَ أَنَّهُ قَدْ أَتَ٠َغْرِبِ وَفِي الصَّلاَةِ فِي السَّفَرِ.

He (the Imam) said, ‘He performs it again to ascertain that he has completed it and so also is the case with Friday, al-Maghrib and Salah (prayer) on a journey.’” حسن - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (5/192))