A compilation of various ahadith to do with Brotherhood.
A Muslim is a brother of another Muslim, so he should not oppress him, nor should he hand him over to an oppressor. Whoever fulfilled the needs of his brother, Allah will fulfill his needs; whoever brought his (Muslim) brother out of a discomfort, Allah will bring him out of the discomforts of the Day of Resurrection, and whoever screened a Muslim, Allah will screen him on the Day of Resurrection.
[narrated Abdullah bin Umar, Sahih al-Bukhari; vol 3:#622]
Do not be angry with each other and do not envy each other and do not turn away from each other, and be slaves of Allah, brothers. It is not halal for a Muslim to shun his brother for more than three nights
[Anas ibn Malik, Muwatta; 47.14]
If one keeps apart from his brother for a year, it is like shedding his blood.
[narrated abuKhirash as-Sulam, abu Dawud]
Each of you is the mirror of his brother, so if he sees any fault in him he should wipe it away from him." Another version has, "The believer is believer's mirror and the believer is the believer's brother who guards him against loss and protects him when he is absent.
[Tirmidhi 4985]
Every act of kindness is "sadaqah" and kindness includes meeting your brother with a cheerful face and pouring water from bucket into your brother's vessel.
[Jabir ibn Abdullah, Ahmad Tirmidhi transmitted it, mishkat]
The Muslim Ummah is like the human body, if one body part aches - then the rest of the body is affected.
There is no Muslim who vindicates the honour of his brother except that it becomes the duty of Allah to remove from him the ####-fire on the Resurrection Day
[narrated Sharhe Sunnat, mishkat Vol 2: #4763]