Sahih al-Bukhari, Hadith 2794 ⓘ
Narrated Sahl bin Sa`d: The Prophet said, "A single endeavor in Allah's Cause in the afternoon and in the forenoon is better than the world and whatever is in it."
حَدَّثَنَا قَبِيصَةُ، حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي حَازِمٍ، عَنْ سَهْلِ بْنِ سَعْدٍ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " الرَّوْحَةُ وَالْغَدْوَةُ فِي سَبِيلِ اللَّهِ أَفْضَلُ مِنَ الدُّنْيَا وَمَا فِيهَا " .
also referenced under: Book 56, Hadith 12 (In-Book) & Volume 4, Book 52, Hadith 52 (USC-MSA)