وَ سَمِعْتُ شَيْخَنَا مُحَمَّدَ بْنَ اَلْحَسَنِ رَضِيَ اَللَّهُ عَنْهُ يَقُولُ: رُوِّيتُ أَنَّهُ سُئِلَ اَلصَّادِقُ عَلَيْهِ اَلسَّلاَمُ عَنْ قَوْلِ اَللَّهِ عَزَّ وَ جَلَّ: «وَ إِذٰا ضَرَبْتُمْ فِي اَلْأَرْضِ فَلَيْسَ عَلَيْكُمْ جُنٰاحٌ أَنْ تَقْصُرُوا مِنَ اَلصَّلاٰةِ إِنْ خِفْتُمْ أَنْ يَفْتِنَكُمُ اَلَّذِينَ كَفَرُوا » فَقَالَ «هَذَا تَقْصِيرُ ثَانٍ وَ هُوَ أَنْ يَرُدَّ اَلرَّجُلُ رَكْعَتَيْنِ إِلَى رَكْعَةٍ.
I heard our teacher, Muhammad ibn al-Hasan, say: It was narrated that Imam Jafar ibn Muhammad Al-Sadiq (a.s) was asked about the words of Allah (swt), the Mighty and Majestic: "And when you travel throughout the land, there is no blame upon you for shortening the prayer, if you fear that those who disbelieve may harm you" (Surah An-Nisa 4:101). Imam (a.s) said: "This refers to a second form of shortening, where a man reduces two rak'ahs to one."