Sayyiduna Hisham bin ‘Amir (may Allah be pleased with him) reports that I heard the Messenger of Allah (peace and blessings be upon him) say:“It is not lawful for a Muslim to sever relations with another Muslim for more than three nights. Indeed, as long as they remain cut off from each other for more than three nights, both of them are away from the truth. Whoever among them returns to the truth first, that is, restores the relationship, his initiative will be an expiation for his previous severance. If both of them die in the state of severed relations, neither of them will enter Paradise.”

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him), he said that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Do not bear malice against one another, do not envy one another, and be, O servants of Allah, brothers to one another."

Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "On the Day of Resurrection, among the worst people in the sight of Allah will be the one who is two-faced, who comes to some people with one face and to others with another face."

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Beware of suspicion, for suspicion is the most false of speech. And do not artificially raise prices, and do not harbor envy or hatred among yourselves, and do not compete with one another (for worldly gains), and do not turn your backs on one another, and be, O servants of Allah, brothers to one another."

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The gates of Paradise are opened on Mondays and Thursdays, and every person who does not associate anything with Allah is forgiven, except for the man between whom and his brother there is enmity. It is said to the angels: 'Hold off on these two until they reconcile.'"

It is narrated from Sayyiduna Abu Darda (may Allah be pleased with him), he says: Shall I not tell you something that is better for you than charity and fasting? Reconciling discord among yourselves. Beware! And malice and enmity shave off (the religion).

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them) that the Prophet (peace and blessings of Allah be upon him) said: "There are three sins; whoever is free from them, Allah Almighty will forgive any other sins He wills: The one who dies without associating partners with Allah, who is not a sorcerer following sorcerers, and who does not harbor malice against his brother."

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that I heard the Prophet (peace and blessings of Allah be upon him) say: "It is not permissible for a man to forsake his believing brother for more than three days. When three days have passed, he should meet him and greet him with salam. If he returns the salam, then both share in the reward, and if he does not reply, then the one who offered salam is absolved of the sin of severing ties."