The Messenger of Allah ﷺ said, "The gates of Paradise are opened on Monday and Thursday, and every servant who does not associate anything with Allah is forgiven, except a man between whom and his brother there is enmity. It is said, 'Wait on these two until they reconcile. Wait on these two until they reconcile.'"
أن رسول الله ﷺ قال: ((تفتح أبواب الجنة يوم الاثنين ويوم الخميس فيغفر لكل عبد لا يشرك بالله شيئا إلا رجلا كانت بينه وبين أخيه شحناء فيقال أنظروا هذين حتى يصطلحا أنظروا هذين حتى يصطلحا))
Muslim narrated it in Al-Birr wal-Silah (2565:35) from Qutayba bin Saeed, from Anas bin Malik in what was read to him, from Suhayl, from his father, from Abu Hurairah, who mentioned it.