Hadith 17:67
Yahya ibn Ma'in narrated to us, from Abu Ishaq, from Muhammad ibn Sa'd, from his father, from the Prophet (may Allah bless him and grant him peace), who said: "It is not lawful for a Muslim to forsake his brother for more than three [days]."
حدثنا يحيى بن معين عن أبي إسحاق عن محمد بن سعد عن أبيه عن النبي صلى الله عليه وسلم قال لا يحل لمسلم أن يهجر أخاه فوق ثلاث