It is narrated from Sayyiduna Abu Ayyub Ansari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "It is not permissible for a Muslim to sever relations with his brother for more than three days; when they meet, one turns away from the other and the other turns away from him. The better of the two is the one who greets (with salam) first."