Ibn 'Abbas reported:The Messenger of Allah (ﷺ) observed the noon and afternoon prayers together in Medina without being in a state of fear or in a state of journey. (Abu Zubair said: I asked Sa'id [one of the narrators] why he did that. He said: I asked Ibn 'Abbas as you have asked me, and he replied that he [the Holy Prophet] wanted that no one among his Ummah should be put to [unnecessary] hardship.)
وَحَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، وَعَوْنُ بْنُ سَلاَّمٍ، جَمِيعًا عَنْ زُهَيْرٍ، - قَالَ ابْنُ يُونُسَ حَدَّثَنَا زُهَيْرٌ، - حَدَّثَنَا أَبُو الزُّبَيْرِ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ صَلَّى رَسُولُ اللَّهِ صلى الله عليه وسلم الظُّهْرَ وَالْعَصْرَ جَمِيعًا بِالْمَدِينَةِ فِي غَيْرِ خَوْفٍ وَلاَ سَفَرٍ . قَالَ أَبُو الزُّبَيْرِ فَسَأَلْتُ سَعِيدًا لِمَ فَعَلَ ذَلِكَ فَقَالَ سَأَلْتُ ابْنَ عَبَّاسٍ كَمَا سَأَلْتَنِي فَقَالَ أَرَادَ أَنْ لاَ يُحْرِجَ أَحَدًا مِنْ أُمَّتِهِ .
Muslim
The Book of Prayer - Travellers • Hadith 60