Sa'd bin Ibrahim سعد بن إبراهيم بن عبد الرحمن · The Chapters on Jihad

I heard Anas bin Malik saying: I heard the Messenger of Allah (ﷺ) say: “Standing guard one night in the cause of Allah is better than a man fasting and praying, among his family, for a thousand years. The year is three hundred and sixty days and a day is like a thousand years.”