Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates this statement of the Noble Prophet (peace and blessings be upon him): "Do not bear malice against one another, do not envy one another, do not turn your backs on one another. Be, O servants of Allah, brothers to one another. It is not permissible for any Muslim to remain estranged from his brother for more than three days."
Hadith Referenceصحیح ابن حبان / كتاب الحظر والإباحة / 5660
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «الإرواء» (2029): ق.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط الشيخين