Full Sharh — Sahih Muslim 1630
وَحَدَّثَنَا يَحْيَى بْنُ حَبِيبٍ الْحَارِثِيُّ، حَدَّثَنَا خَالِدٌ، - يَعْنِي ابْنَ الْحَارِثِ - حَدَّثَنَا قُرَّةُ، حَدَّثَنَا أَبُو الزُّبَيْرِ، حَدَّثَنَا سَعِيدُ بْنُ جُبَيْرٍ، حَدَّثَنَا ابْنُ عَبَّاسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم جَمَعَ بَيْنَ الصَّلاَةِ فِي سَفْرَةٍ سَافَرَهَا فِي غَزْوَةِ تَبُوكَ فَجَمَعَ بَيْنَ الظُّهْرِ وَالْعَصْرِ وَالْمَغْرِبِ وَالْعِشَاءِ . قَالَ سَعِيدٌ فَقُلْتُ لاِبْنِ عَبَّاسٍ مَا حَمَلَهُ عَلَى ذَلِكَ قَالَ أَرَادَ أَنْ لاَ يُحْرِجَ أُمَّتَهُ .
English Translation
Ibn 'Abbas reported that the Messenger of Allah (ﷺ) combined the prayers as he set on a journey in the expedition to Tabuk. He combined the noon prayer with the afternoon prayer and the sunset prayer with the 'Isha' prayer. Sa'id (one of the rawis) said to Ibn 'Abbas:What prompted him to do this? He said: He wanted that his Ummah should not be put to (unnecessary) hardship
Source
Sahih Muslim(صحيح مسلم)
The Book of Prayer - Travellers
Hadith Number
1630