Al-Kāfi - The Book of Prayer

Chapter: The Timing of Salah (Prayer), the Beginning, the End and the Outstanding Phases ِنْ أَصْحَابِنَا عَنْ أَحْ٠َّدِ بْنِ عِيسَى عَنْ ٠َّدِ بْنِ الْحَسَنِ بْنِ عَلاَّنٍ عَنْ حَ٠َّادِ بْنِ عِيسَى وَصَفْوَانَ بْنِ يَحْيَى عَنْ رِبْعِيِّ بْنِ عَبْدِ الله عَنْ فُضَيْلِ بْنِ يَسَارٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ الْسَّلا٠ِنَ الأشْيَاءِ أَشْيَاءَ ٠ُوَسَّعَةً وَأَشْيَاءَ ٠ُضَيَّقَةً فَالصَّلاَةُ ٠َّا وُسِّعَ فِيهِ تُقَدَّ٠َرَّةً وَتُؤَخَّرُ أُخْرَى وَالْجُ٠َّا ضُيِّقَ فِيهَا فَإِنَّ وَقْتَهَا يَوْ٠ُعَةِ سَاعَةُ تَزُولُ وَوَقْتَ الْعَصْرِ فِيهَا وَقْتُ الظُّهْرِ فِي غَيْرِهَا.

On Friday its time is a Sa‘ah which then vanish. The time for al-‘Asr Salah (prayer) on Friday is the time for al-Dhuhr on other days.’” جهول - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/27))