It is narrated from Sayyiduna Abu Khirash al-Sulami (may Allah be pleased with him) that he heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever cuts off his brother for a year, that is like shedding his blood."
Hadith Referenceالمعجم الكبير للطبراني / مسند من يعرف بالكنى / 18984