(5) باب جَوَازِ الْجَمْعِ بَيْنَ الصَّلاَتَيْنِ فِي السَّفَرِ
Salim b. 'Abdullah reported that his father had said:
I saw the Messenger of Allah (ﷺ) delaying the sunset prayer till he would combine it with the 'Isha' when he hastened to set out on a journey.
Reference: Sahih Muslim 703 d
In-book reference: Book 6, Hadith 55
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1511