[Machine] Abu Sa'id said to Ibn Abbas, may Allah have mercy on him, "Repent to Allah and seek His forgiveness." Ibn Abbas replied, "Don't you know that the Messenger of Allah forbade exchanging gold with gold and silver with silver?" He also said, "I fear for you the sin of usury." I asked Atiyyah, "What is usury?" He replied, "It is the increase and excess between them."  

أَبُو سَعِيدٍ لِابْنِ عَبَّاسٍ رَحِمَهُ اللهُ تُبْ إِلَى اللهِ ﷻ فَقَالَ أَسْتَغْفِرُ اللهَ وَأَتُوبُ إِلَيْهِ قَالَ أَلَمْ تَعْلَمْ «أَنَّ رَسُولَ اللهِ ﷺ نَهَى عَنِ الذَّهَبِ بِالذَّهَبِ وَالْفِضَّةِ بِالْفِضَّةِ» وَقَالَ «إِنِّي أَخَافُ عَلَيْكُمُ الرِّبَا؟» قُلْتُ لِعَطِيَّةَ مَا الرِّبَا؟ قَالَ «الزِّيَادَةُ وَالْفَضْلُ بَيْنَهُمَا»