Narrated from Sayyiduna Hisham bin ‘Amir (may Allah be pleased with him), whose father was martyred in Uhud, that he heard the Messenger of Allah (peace and blessings of Allah be upon him) say:“It is not lawful for a Muslim to cut off relations with another Muslim for more than three days. As long as both of them maintain this break in relations, both are deviating from the truth. Whoever among them returns to the truth, that is, restores the relationship, his initiative will be an expiation for his previous severance. If both of them die in a state of severed relations, neither of them will ever enter Paradise. If one of them greets the other with salam and the other refuses to accept his greeting, then an angel responds to the one who offered salam, and Satan responds to the one who refused.”