وَ سَأَلَ مُحَمَّدُ بْنُ مُسْلِمٍ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ فَقَالَ لَهُ: اَلرَّجُلُ يُرِيدُ اَلسَّفَرَ مَتَى يُقَصِّرُ قَالَ «إِذَا تَوَارَى مِنَ اَلْبُيُوتِ» قَالَ قُلْتُ لَهُ اَلرَّجُلُ يُرِيدُ اَلسَّفَرَ فَيَخْرُجُ حِينَ تَزُولُ اَلشَّمْسُ فَقَالَ «إِذَا خَرَجْتَ فَصَلِّ رَكْعَتَيْنِ.
Muhammad ibn Muslim asked Abu Abdullah (a.s) about when a person who intends to travel should begin shortening their prayers. He (a.s) replied: "When he is no longer within sight of the houses." Muhammad then said: "If a person intends to travel and leaves at the time of the sun's decline (midday), what should he do?" He (a.s) replied: "When you leave, pray two units (Rak'ahs)."