لَا یَحِلُّ لِمُؤمِنٍ اَنْ یَّجُهْرَ أخَاهُ فَوقَ ثَلَاثَةِ أیَّامٍ
It is unlawful for a believer to sever relations with his brother for more than three days
The 11th of the 40 hadiths gathered by Shah Waliullah ad-Dehlawi in Shah Waliullah's Forty Hadith, given below in the original Arabic with an English translation and its reference.
لَا یَحِلُّ لِمُؤمِنٍ اَنْ یَّجُهْرَ أخَاهُ فَوقَ ثَلَاثَةِ أیَّامٍ
It is unlawful for a believer to sever relations with his brother for more than three days
Text from the open hadith-api dataset. Hadith numbering follows that edition and can differ slightly from a printed copy — check the Arabic against a trusted mushaf of hadith before relying on a reference.