462.Hadhrat Abu Ayyub Ansaari (Allah be pleased with him) narrates that Muhammad (peace be upon him) said: "It is not lawful for a Muslim to sever his ties with another Muslim for more than three days, in such a way that when they meet, the one who turns his face one way and the one other turns his face the other way. The better of these two is the one who makes Salaam first."
(Bukhari, Muslim).
(Hayaat-ul-Muslimeen. by Mohammad Ashraf Ali Thanvi).