What did Prophet Muhammad (peace be upon him) say about two Muslim brothers who have not seen each other for more than three nights?
 Narrated Abu Aiyub Al-Ansari:                     Allah's Apostle said, "It is not lawful for a man to desert his brother Muslim for more than three nights. (It is unlawful for them that) when they meet, one of them turns his face away from the other, and the other turns his face from the former, and the better of the two will be the one who greets the other first."