It was narrated that Sa’eed bin Khalid bin Abu Tuwail said: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.”
حَدَّثَنَا عِيسَى بْنُ يُونُسَ الرَّمْلِيُّ، حَدَّثَنَا مُحَمَّدُ بْنُ شُعَيْبِ بْنِ شَابُورَ، عَنْ سَعِيدِ بْنِ خَالِدِ بْنِ أَبِي الطَّوِيلِ، قَالَ سَمِعْتُ أَنَسَ بْنَ مَالِكٍ، يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " حَرْسُ لَيْلَةٍ فِي سَبِيلِ اللَّهِ أَفْضَلُ مِنْ صِيَامِ رَجُلٍ وَقِيَامِهِ فِي أَهْلِهِ أَلْفَ سَنَةٍ السَّنَةُ ثَلاَثُمِائَةٍ وَسِتُّونَ يَوْمًا وَالْيَوْمُ كَأَلْفِ سَنَةٍ " .
IbnMaja
The Chapters on Jihad • Hadith 2770