Mishkat al-Masabih 11 Business Transactions كتاب البيوع 71

وَعَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِذَا أَقْرَضَ الرَّجُلُ الرَّجُلَ فَلَا يَأْخُذُ هَدِيَّةً» . رَوَاهُ الْبُخَارِيُّ فِي تَارِيخِهِ هَكَذَا فِي الْمُنْتَقى

He reported the Prophet as saying, “When a man makes a loan to another he must not accept a present.” Bukhari transmitted it in his Ta’rikh , as is said in al-Muntaqa .