Sahih Bukhari Volume 3, Book 26, Hadith 1806

حَدَّثَنَا سَعِيدُ بْنُ أَبِي مَرْيَمَ، أَخْبَرَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، قَالَ أَخْبَرَنِي زَيْدُ بْنُ أَسْلَمَ، عَنْ أَبِيهِ، قَالَ كُنْتُ مَعَ عَبْدِ اللَّهِ بْنِ عُمَرَ رضى الله عنهما 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

Narrated By 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 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)."