كتاب المواقيت
6  
The Book of the Times (of Prayer)
(46)
Chapter: Situations During Which It Is Permissible To Combine Two Prayers
(46)
باب الْحَالِ الَّتِي يُجْمَعُ فِيهَا بَيْنَ الصَّلاَتَيْنِ
Sunan an-Nasa'i 598
It was narrated from Ibn 'Umar that if the Messenger of Allah (ﷺ) was in a hurry to travel, he would combine Maghrib and 'Isha'.
أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ إِذَا جَدَّ بِهِ السَّيْرُ جَمَعَ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ ‏.‏
Grade: Sahih (Darussalam)
Reference : Sunan an-Nasa'i 598
In-book reference : Book 6, Hadith 105
English translation : Vol. 1, Book 6, Hadith 599