Sahih Muslim Book - 45, Hadith - 6546

حَدَّثَنَا ابْنُ أَبِي عُمَرَ ، حَدَّثَنَا سُفْيَانُ ، عَنْ مُسْلِمِ بْنِ أَبِي مَرْيَمَ ، عَنْ أَبِي صَالِحٍ ، سَمِعَ أَبَا هُرَيْرَةَ ، رَفَعَهُ مَرَّةً قَالَ: تُعْرَضُ الأَعْمَالُ فِي كُلِّ يَوْمِ خَمِيسٍ وَاثْنَيْنِ ، فَيَغْفِرُ اللَّهُ عَزَّ وَجَلَّ فِي ذَلِكَ الْيَوْمِ ، لِكُلِّ امْرِئٍ لاَ يُشْرِكُ بِاللَّهِ شَيْئًا ، إِلاَّ امْرَءًا كَانَتْ بَيْنَهُ وَبَيْنَ أَخِيهِ شَحْنَاءُ ، فَيُقَالُ: ارْكُوا هَذَيْنِ حَتَّى يَصْطَلِحَا ، ارْكُوا هَذَيْنِ حَتَّى يَصْطَلِحَا.

It was narrated that Abu Salih heard Abu Hurairah say, attributing it on one occasion to the Messenger of Allah (s.a.w): "Deeds are presented (before Allah) every Thursday and Monday, and on that day Allah forgives every person who does not associate anything with Allah, except a man between whom and his brother there is some grudge. It is said: 'Delay these two until they reconcile, delay these two until they reconcile."'