Yahya related to me from Malik from Suhayl ibn Abi Salih from hisfather from Abu Hurayra that the Messenger of Allah, may Allah blesshim and grant him peace, said, "The doors of the Garden are opened onMonday and Thursday. Every muslim slave who does not associateanything with Allah is forgiven except for the man who has enmitybetween him and his brother. It is said, 'Leave these two until theyhave made a reconciliation. Leave these two until they have made areconciliation.' "
USC-MSA web (English) reference: Book 47, Hadith 17
Arabic reference: Book 47, Hadith 1652