When I came to Medina. I met ʿAbdullah bin Salam. He said, "Will you come to me so that I may serve you with Sawiq (i.e. powdered barley) and dates, and let you enter a (blessed) house that in which the Prophet ﷺ entered?" Then he added, "You are In a country where the practice of Riba (i.e. usury) is prevalent; so if somebody owe you something and he sends you a present of a load of chopped straw or a load of barley or a load of provender then do not take it, as it is Riba."  

أَلاَ تَجِيءُ فَأُطْعِمَكَ سَوِيقًا وَتَمْرًا وَتَدْخُلَ فِي بَيْتٍ ثُمَّ قَالَ إِنَّكَ بِأَرْضٍ الرِّبَا بِهَا فَاشٍ إِذَا كَانَ لَكَ عَلَى رَجُلٍ حَقٌّ فَأَهْدَى إِلَيْكَ حِمْلَ تِبْنٍ أَوْ حِمْلَ شَعِيرٍ أَوْ حِمْلَ قَتٍّ فَلاَ تَأْخُذْهُ فَإِنَّهُ رِبًا وَلَمْ يَذْكُرِ النَّضْرُ وَأَبُو دَاوُدَ وَوَهْبٌ عَنْ شُعْبَةَ الْبَيْتَ