Mishkat al-Masabih 11 Business Transactions كتاب البيوع 32

عَنْ جَابِرٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: رَحِمَ اللَّهُ رَجُلًا سَمْحًا إِذَا بَاعَ وَإِذَا اشْتَرَى وَإِذَا اقْتَضَى رَوَاهُ البُخَارِيّ

Jabir reported God’s Messenger as saying, “God show mercy to a man who is kindly when he sells, when he buys, and when he makes a claim!” Bukhari transmitted it.