Full Sharh — Riyad as-Salihin 914
وعن أبي هريرة رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم : "تعرض الأعمال في كل اثنين وخميس، فيغفر الله لكل امرئ لا يشرك بالله شيئا، إلا امرءا كانت بينه وبين أخيه شحناء، فيقول: اتركوا هذين حتى يصطلحا" ((رواه مسلم)).
English Translation
Abu Hurairah (May Allah be pleased with him) said:: The Messenger of Allah (ﷺ) said, "People's deeds are presented before Allah on Mondays and Thursdays, and then every slave (of Allah) is granted forgiveness (of minor sins) if he does not associate anything with Allah in worship. But the person in whose heart there is rancour against his brother, will not be pardoned. With regard to them, it is said twice: 'Hold these two until they are reconciled'.".
Source
Riyad as-Salihin(رياض الصالحين)
The Book of the Prohibited actions
Hadith Number
914