(13) باب الْجَمْعِ فِي السَّفَرِ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ
Narrated Anas:
Allah's Messenger (ﷺ) used to offer these two prayers together on journeys i.e. the Maghrib and the `Isha'. (ID)
Reference (ID): Sahih al-Bukhari 1108 (ID)
In-book reference (ID): Book 18, Hadith 28 (ID)
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 20, Hadith 211 (ID)