Narrated by Anas bin Malik (Radiyallaahu `anhu) Allah’s Apostle (Sallallaahu `alayhi wa sallam) said,
”Whoever prays like us and faces our Quibla and eats our slaughtered animals is a Muslim and is under Allah’s and His Apostle’s protection. So do not betray Allah by betraying those who are in His protection.”

Anas b. Malik (Radiyallaahu `anhu) reported Allah’s Messenger (Sallallaahu `alayhi wa sallam) said:
“Neither nurse mutual hatred, nor jealousy, nor enmity, and become as fellow brothers and servants of Allah. It is not lawful for a Muslim that he should keep his relations estranged with his brother beyond three days.”

Salim reported on the authority of his father (Radiyallaahu `anhum) that Allah’s Messenger (Sallallaahu `alayhi wa sallam) said:
“A Muslim is the brother of a fellow-Muslim. He should neither commit oppression upon him nor ruin him, and he who meets the need of a brother, Allah would meet big needs, and he who relieved a Muslim from hardship Allah would relieve him from the hardships to which he would be put on the Day of Resurrection, and he who did not expose (the follies of a Muslim) Allah would conceal his …

Abu Hurairah (Radiyallaahu `anhu) reported Allah’s last Messenger (Sallallaahu `alayhi wa sallam) said:
“Do you know what is backbiting?”
They (the Companions) said:
“Allah and His Messenger know best.”
Thereupon he (the Prophet) said:
“Backbiting implies your talking about your brother in a manner which he does not like.”
It was said to him:
“What is your opinion about this that if I actually find (that failing) in my brother which I made a mention of?”
He said:
“If (that failing) is actually found (in him) what you assert, you in fact backbited him, …

Abu Hurairah (Radiyallaahu `anhu) reported Allah’s Apostle (Sallallaahu `alayhi wa sallam) said:
“The servant (who conceals) the faults of others in this world, Allah would conceal his faults on the Day of Resurrection.”

Nu’man b. Bashir reported that the Last Messenger of Allah (Sallallaahu `alayhi wa sallam) said:
“The similitude of believers in regard to mutual love, affection, fellow-feeling is that of one body; when any limb of it aches, the whole body aches, because of sleeplessness and fever.”

On the authority of Umm Darda (Radiyallahu `anhuma) it is reported that Prophet (Sallallaahu `alayhi wa sallam) said:
“…the dua of a muslim for his brother (in Islam) in his absence is readily accepted, and an angel is appointed to his side, whenever he makes a beneficial dua for his brother the appointed angel says “Ameen and may you also be blessed with the same.”

On the Authority of Abu Hurayrah (Radiyallahu `anhu), the Prophet (Sallallaahu `alayhi wa sallam) said,
“A believer is a mirror to another believer. A believer is a brother to another believer. He saves him from losses. He safeguards his interests in his absence.”