Sayyiduna Abu Khirash al-Sulami (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever cuts off his brother for a year, it is as though he has shed his blood."
Hadith Referenceالمعجم الكبير للطبراني / مسند من يعرف بالكنى / 18983