(8) باب تَحْرِيمِ الْهَجْرِ فَوْقَ ثَلاَثٍ بِلاَ عُذْرٍ شَرْعِيٍّ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
There should be no estranged relations beyond three days.
Reference: Sahih Muslim 2562
In-book reference: Book 45, Hadith 34
USC-MSA web (English) reference(deprecated numbering scheme): Book 32, Hadith 6213