Riyad as-Salihin, Book 12, Hadith 1290 (In-Book) ⓘ
Sahl bin Sa'd (May Allah be pleased with him) reported: The Messenger of Allah said, "Observing Ribat (e.g., guarding the Islamic frontier for the sake of Allah) for a single day is far better than the world and all that it contains. A place in Jannah as small as the whip of your horse is far better than the world and all that it contains. An endeavour (fighting) in the Cause of Allah in the evening or in the morning is far better than the world and all that it contains."[Al-Bukhari and Muslim].
وعن سهل بن سعد رضي الله عنه أن رسول الله صلى الله عليه وسلم قال: "رباط يوم في سبيل الله خير من الدنيا وما عليها، وموضع سوط أحدكم من الجنة خير من الدنيا وما عليها، والروحة يروحها العبد في سبيل الله تعالى، أو الغدوة خير من الدنيا وما عليها. ((متفق عليه))