(8) باب تَحْرِيمِ الْهَجْرِ فَوْقَ ثَلاَثٍ بِلاَ عُذْرٍ شَرْعِيٍّ
'Abdullah b. 'Umar reported Allah's Messenger (ﷺ) as saying:
It is not permissible for a Muslim to have estranged relations with his brother beyond three days.
Reference: Sahih Muslim 2561
In-book reference: Book 45, Hadith 33
USC-MSA web (English) reference(deprecated numbering scheme): Book 32, Hadith 6212