The Book of Jihad
Riyad as-Salihin #612
كتاب الجهاد
وعن سلمان رضي الله عنه قال: سمعت رسول الله صلى الله عليه وسلم يقول: «رباط يوم وليلة خير من صيام شهر وقيامه، وإن مات فيه أجري عليه عمله الذي كان يعمل، وأجري عليه رزقه، وأمن الفتان» ((رواه مسلم)).
Salman (May Allah be pleased with him) reported:
I heard the Messenger of Allah (ﷺ) as saying, “Observing Ribat in the way of Allah for a day and a night is far better than observing Saum (fasting) for a whole month and standing in Salat (prayer) in all its nights. If a person dies (while performing this duty), he will go on receiving his reward for his meritorious deeds perpetually, and he will be saved from Al- Fattan.”.
وعن سلمان رضي الله عنه قال: سمعت رسول الله صلى الله عليه وسلم يقول: "رباط يوم وليلة خير من صيام شهر وقيامه، وإن مات فيه أجري عليه عمله الذي كان يعمل، وأجري عليه رزقه، وأمن الفتان" ((رواه مسلم)).
I heard the Messenger of Allah (ﷺ) as saying, "Observing Ribat in the way of Allah for a day and a night is far better than observing Saum (fasting) for a whole month and standing in Salat (prayer) in all its nights. If a person dies (while performing this duty), he will go on receiving his reward for his meritorious deeds perpetually, and he will be saved from Al- Fattan.".
— Riyad as-Salihin, Hadith 612