وَعَنْ أَنَسٍ
«كَانَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: إِذَا اِرْتَحَلَ قَبْلَ أَنْ تَزِيغَ اَلشَّمْسُ أَخَّرَ اَلظُّهْرَ إِلَى وَقْتِ اَلْعَصْرِ، ثُمَّ نَزَلَ فَجَمَعَ بَيْنَهُمَا، فَإِنْ زَاغَتْ اَلشَّمْسُ قَبْلَ أَنْ يَرْتَحِلَ صَلَّى اَلظُّهْرَ، ثُمَّ رَكِبَ» 1 مُتَّفَقٌ عَلَيْهِ.1 صحيح
When the Messenger of Allah (sallallahu alayhi wa sallam) (while on a journey) proceeded before the sun had declined from the centre of the sky, he (sallallahu alayhi wa sallam) delayed the Zuhr prayer till the time of the Asr prayer; he (sallallahu alayhi wa sallam) would then alight and combine the two prayers. If the sun declined before he (sallallahu alayhi wa sallam) moved off, he (sallallahu alayhi wa sallam) would offer the Zuhr prayer and ride (i.e. travel).