Anas reported God’s Messenger as saying, "When one of you makes a loan and the borrower sends him a present or provides an animal for him to ride, he must not ride the one or accept the other unless it is a practice they followed previously."
Ibn Majah and Baihaqi, in Shu'ab al-iman, transmitted it.
وَعَنْ أَبِي بُرْدَةَ بْنِ أَبِي مُوسَى قَالَ: قدمت الْمَدِينَة فَلَقِيت عبد الله بن سلا م فَقَالَ: إِنَّك بِأَرْض فِيهَا الرِّبَا فَاش إِذا كَانَ لَكَ عَلَى رَجُلٍ حَقٌّ فَأَهْدَى إِلَيْكَ حِمْلَ تَبْنٍ أَو حِملَ شعيرِ أَو حَبْلَ قَتٍّ فَلَا تَأْخُذْهُ فَإِنَّهُ رِبًا. رَوَاهُ الْبُخَارِيُّ
Narrated Abu Burda b. Abu Musa said:
I came to Medina and met 'Abdallah b. Salam who said, "You are in a land in which usury is common, so when anyone owes you anything and presents you with a load of straw, or a load of barley, or a rope of lucerne grass, do not accept it for it is usury."
The last verse to be sent down was that on usury (Al-Qur’an 2:275) but God's Messenger was taken without having expounded it to us; so leave aside usury and whatever is doubtful.