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
Sunni collections: text from the open hadith-api dataset. Al-Kafi: Arabic text, Muhammad Sarwar's translation and gradings from Thaqalayn.net via the Thaqalayn API. Hadith numbering follows those editions and can differ from a printed copy — check the Arabic against a trusted edition before relying on a reference.