كتاب الإمارة
33  
The Book on Government
(30)
Chapter: The virtue of going out in the morning or the evening in the cause of Allah
(30)
باب فَضْلِ الْغَدْوَةِ وَالرَّوْحَةِ فِي سَبِيلِ اللَّهِ ‏‏
Sahih Muslim 1881 b

It has been narrated on the authority of Sahl b. Sa'd as-Sa'idi that the Messenger of Allah (ﷺ) said:

A journey undertaken in the morning or evening (fond Jihad) in the way of Allah (will merit a reward) better than the world and all that is in it.
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَزُهَيْرُ بْنُ حَرْبٍ، قَالاَ حَدَّثَنَا وَكِيعٌ، عَنْ سُفْيَانَ، عَنْ أَبِي حَازِمٍ، عَنْ سَهْلِ بْنِ سَعْدٍ السَّاعِدِيِّ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ غَدْوَةٌ أَوْ رَوْحَةٌ فِي سَبِيلِ اللَّهِ خَيْرٌ مِنَ الدُّنْيَا وَمَا فِيهَا ‏"‏ ‏.‏
Reference : Sahih Muslim 1881b
In-book reference : Book 33, Hadith 171
USC-MSA web (English) reference : Book 20, Hadith 4641
  (deprecated numbering scheme)