It is narrated from Sayyiduna Abu Khirash al-Sulami (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A believer's cutting off his brother for a year is like shedding his blood."
Hadith Referenceالمعجم الكبير للطبراني / مسند من يعرف بالكنى / 18985