It is narrated from Hazrat Usama bin Zaid (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: There is no usury in cash transactions; it is only in credit transactions.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 21762
Hadith Gradingحکم دارالسلام:حديث صحيح، خ: 2178، م: 1596، وهذا إسناد حسن