Brotherhood, Love and Unity In Islam

Allah says in The Noble Qur'an: "The Believers are but a single Brotherhood." [Al-Hujurat 49:10]

The Messenger of Allah (SWT) said, "When Muslims are angry with each other for three days. If they do not compromise then they go away from the limits of Islam and the one who compromise first will enter Jannah (Paradise) earlier."

The Messenger of Allah (SWT) said, "The Muslims are like a body, if one part of the body hurts, rest of the body will also suffer."

The Messenger of Allah (SWT) said, "Believers are brethren, their lives are equal to each other and they are as one hand against their enemy."

The Messenger of Allah (SWT) said, "It is not permissible for two Muslims to be annoyed and angry for more that three days."

It is obligatory to say salaam and return salaams, because by doing so a Muslim is giving you safety and you have to give him safety in return. It is as if he is saying to you, “I am giving you safety and security,” so you have to give him the same, so that he does not get suspicious or think that the one to whom he has given salaam is betraying him or ignoring him. The Prophet (peace and blessings of Allaah be upon him) told us that if Muslims are ignoring or forsaking one another, this will be put to an end when one of them gives salaam. Al-Bukhaari (6233) reported that Abu Ayyoob (may Allaah be pleased with him) said: “The Messenger of Allaah (peace and blessings of Allaah be upon him) said: ‘It is not permissible for a Muslim to forsake his brother for more than three days, each of them turning away from the other if they meet. The better of them is the first one to say salaam.’”
This is a brief overview of the importance of giving and returning salaam.