Sahih al-Bukhari 26:30
Narrated Zaid bin Aslam from his father:
I was with Ibn `Umar on the way to Mecca, and he got the news that Safiya bint Abu Ubaid was seriously ill. So, he hastened his pace, and when the twilight disappeared, he dismounted and offered the Maghrib and `Isha' prayers together. Then he said, "I saw that whenever the Prophet (ﷺ) had to hasten when traveling, he would delay the Maghrib prayer and join them together (i.e. offer the Maghrib and the `Isha prayers together).
Reference
Sahih al-Bukhari 26:30
In-book reference
Book 26, Hadith 30
Arabic Text
حَدَّثَنَا سَعِيدُ بْنُ أَبِي مَرْيَمَ، أَخْبَرَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، قَالَ أَخْبَرَنِي زَيْدُ بْنُ أَسْلَمَ، عَنْ أَبِيهِ، قَالَ كُنْتُ مَعَ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ بِطَرِيقِ مَكَّةَ، فَبَلَغَهُ عَنْ صَفِيَّةَ بِنْتِ أَبِي عُبَيْدٍ شِدَّةُ وَجَعٍ فَأَسْرَعَ السَّيْرَ، حَتَّى كَانَ بَعْدَ غُرُوبِ الشَّفَقِ نَزَلَ، فَصَلَّى الْمَغْرِبَ وَالْعَتَمَةَ، جَمَعَ بَيْنَهُمَا، ثُمَّ قَالَ إِنِّي رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم إِذَا جَدَّ بِهِ السَّيْرُ أَخَّرَ الْمَغْرِبَ، وَجَمَعَ بَيْنَهُمَا.