AbuKhirash heard the Messenger of Allah ﷺ say: If one keeps apart from his brother for a year, it is like shedding his blood. (Using translation from Abū Dāʾūd 4915)   

أَنَّهُ سَمِعَ النَّبِيَّ ﷺ يَقُولُ مَنْ هَجَرَ أَخَاهُ سَنَةً فَهُوَ كَسَفْكِ دَمِهِ