Umm Kulthum bint Uqbah bin Abi Mu'it (may Allah be pleased with her) narrates: I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: "The person who reconciles between people is not a liar; he speaks good words and conveys good words (to both sides)." Imam Muslim has narrated this addition: Umm Kulthum (may Allah be pleased with her) said, "I did not hear him—that is, the Prophet (peace and blessings of Allah be upon him)—permit lying in any matter except for three things: in war, in reconciling between people, and in conversation between a husband and wife." Agreed upon.

And the hadith narrated from Jabir (may Allah be pleased with him): "Satan has despaired." It is mentioned in the chapter of Waswasah. Narrated by Muslim.

Asma bint Yazid (may Allah be pleased with her) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Lying is permissible only in three cases: a man lying to please his wife, lying during war, and lying to reconcile between people." Sahih, narrated by Ahmad and Tirmidhi.

It is narrated from Aisha (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "It is not appropriate for a Muslim to cut off relations with another Muslim for more than three days. When he meets him, he should greet him with salam three times. If each time the other does not respond to the salam, then (the one who offered salam) is absolved of the sin of breaking relations." Its chain is Hasan. Narrated by Abu Dawood.

It is narrated from Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "It is not permissible for any Muslim to sever relations with his (Muslim) brother for more than three days. Whoever severs relations for more than three days and dies in that state, he will enter Hell." Its chain is authentic. Narrated by Ahmad and Abu Dawood.

Abu Khirash Salmi (may Allah be pleased with him) reports that he heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever severs contact with his brother for a whole year, it is as if he has shed his blood." Hasan, narrated by Abu Dawood.

Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings of Allah be upon him) said: "It is not permissible for a believer to shun another believer for more than three days. When three days have passed, he should meet him and greet him with salam. If the other responds to the salam, then both share in the reward; but if he does not respond, then that person bears the sin, while the one who offered salam is absolved from the act of shunning." Its chain is weak. Narrated by Abu Dawood.

Abu Darda (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Shall I not tell you of an act better in rank than fasting, charity, and prayer?" The narrator states, we said: "Do tell us." He (peace and blessings be upon him) said: "Reconciling between two parties, friends, or relatives; for discord between two parties is a trait that destroys (good deeds)." Abu Dawood, Tirmidhi, and Imam Tirmidhi (may Allah have mercy on him) said: This hadith is authentic. Its chain is weak, narrated by Abu Dawood and Tirmidhi.

Zubair (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: "The disease of previous nations has crept into you (unnoticed): envy and hatred and enmity, and it is something that destroys good deeds. I am not saying that it shaves the hair, but rather it destroys the religion." Its chain is Hasan. Narrated by Ahmad and al-Tirmidhi.

Abu Hurairah, may Allah be pleased with him, narrates from the Prophet, peace and blessings be upon him, that he said: "Beware of envy, for envy consumes good deeds just as fire consumes wood." Its chain of narration is weak. Narrated by Abu Dawood.