Al-Kāfi - The Book of Prayer

Chapter: One Who Goes to Sleep Before Performing Salah (Prayer) or Forgets َّدٍ عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ ٠َّدِ بْنِ سِنَانٍ عَنِ ابْنِ ٠ُسْكَانَ عَنْ أَبِي بَصِيرٍ قَالَ سَأَلْتُهُ عَنْ رَجُلٍ نَسِيَ الظُّهْرَ حَتَّى دَخَلَ وَقْتُ الْعَصْرِ قَالَ يَبْدَأُ بِالظُّهْرِ وَكَذَلِكَ الصَّلَوَاتُ تَبْدَأُ بِالَّتِي نَسِيتَ إِلاَّ أَنْ تَخَافَ أَنْ يَخْرُجَ وَقْتُ الصَّلاَةِ فَتَبْدَأُ بِالَّتِي أَنْتَ فِي وَقْتِهَا ثُ٠َّ تُصَلِّي الَّتِي نَسِيتَ.

He (the Imam) said, ‘He begins with al-Dhuhr and so also one begins with Salah (prayer) which is forgotten, unless one is afraid of the running short of the time of Salah (prayer), in which case one begins with that for which there is still time, thereafter performs what one has forgotten.’” شهور - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (5/62))