It is narrated from Sayyiduna Fadalah bin Ubayd (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever cuts off his brother for more than three days is in the Fire, unless Allah rescues him by His generosity."
Hadith Referenceالمعجم الكبير للطبراني / باب الفاء / 15906