أَخْبَرَنَا أَبُو عَاصِمٍ ، عَنْ ابْنِ جُرَيْر ، عَنْ عُبَيْدِ اللَّهِ بْنِ أَبِي يَزِيدَ ، عَنِ ابْنِ عَبَّاسٍ ، قَالَ : أَخْبَرَنِي أُسَامَةُ بْنُ زَيْدٍ : أَنّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ، قَالَ :" إِنَّمَا الرِّبَا فِي الدَّيْنِ ".
قَالَ عَبْد اللَّهِ : مَعْنَاهُ : دِرْهَمٌ بِدِرْهَمَيْنِ

Abu Asim informed us, on the authority of Ibn Jarir, on the authority of Ubayd Allah ibn Abi Yazid, on the authority of Ibn Abbas, he said: Usama ibn Zaid informed me: The Messenger of God, may God bless him and grant him peace, said: “Usury is only in debt.”
Abdullah said: It means: one dirham for two dirhams.