[Machine] The Messenger of Allah (peace and blessings be upon him) used to combine the Dhuhr and Asr prayers when he was traveling at the time when the sun starts to decline. And if he would travel before that time, he would combine them at the time of Asr.
كَانَ رَسُولُ اللهِ ﷺ «إِذَا كَانَ فِي سَفَرٍ فَارْتَحَلَ حِينَ تَزِيغُ الشَّمْسُ جَمَعَ بَيْنَ الظُّهْرِ وَالْعَصْرِ وَإِذَا ارْتَحَلَ قَبْلَ ذَلِكَ جَمَعَ بَيْنَهُمَا فِي وَقْتِ الْعَصْرِ»
"If the Messenger of Allah ﷺ was setting out on a journey before the sun passed its zenith, he would delay Zuhr until the time of 'Asr, then he would stop and combine the prayer. If the sun passed its zenith before he set out, he would pray Zuhr and then set off. (Using translation from Nasāʾī 586)
«كَانَ رَسُولُ اللَّهِ ﷺ إِذَا ارْتَحَلَ قَبْلَ أَنْ تَزِيغَ الشَّمْسُ أَخَّرَ الظُّهْرَ إِلَى وَقْتِ الْعَصْرِ ثُمَّ نَزَلَ فَجَمَعَ بَيْنَهُمَا وَإِذَا زَاغَتْ قَبْلَ أَنْ يَرْتَحِلَ صَلَّى ثُمَّ رَحَلَ»