The love among the fellow brothers in religion (Islam) increases with their sincerity, honesty, and loyalty. Sincerity among them leads to Wafâ, which is the constancy in friendship and the highest level of love and sincerity. The Prophet of Allâh (sallallâhu alayhi wa sallam) established brotherhood among his Sahâbah (companions) through which sincerity and love increased and their support to each other strengthened. In this regard, Nabî (sallallâhu alayhi wa sallam) said: “I advise you to take sincere and pure fellow brothers, for they are (like) ornament to you at times of ease, and security at times of calamities.”
“A person is strong with his fellow Muslim brother. There is no good in the friendship of a person who does not want for you what he wants for himself.”
Umar bin Khattâb (radiyallâhu anh) said: “Being in the company of fellow Muslim brothers eliminates sorrows.”
Khâlid bin Safwân said: “Indeed the most helpless among the people is he who cannot build brotherhood with people. The person weaker than that is the one who ruins the friendship with his fellow brothers who could be beneficial to him (in worldly and religious matters).”
Ibn Mutaz said: “When a person finds genuine brothers (in Din) for himself, they will support him (for all matters concerning the Dunya and the Akhirah).” Moreover, some Ulamâ (Islamic scholars) said: “The best preparation for a rainy day is to acquire loyal fellow Muslims brothers.”