بُلُوغُ الْمَرَامِ
Bulugh al-Maram 861
Business Transactions
وَعَنْ عَلِيٍّ - رضى الله عنه - قَالَ: قَالَ رَسُولُ اَللَّهِ -صَلَّى اَللَّهُ عَلَيْهِ وَسَلَّمَ { كُلُّ قَرْضٍ جَرَّ مَنْفَعَةً, فَهُوَ رِبًا } رَوَاهُ اَلْحَارِثُ بْنُ أَبِي أُسَامَةَ, وَإِسْنَادُهُ سَاقِطٌ [1] .
Narrated 'Ali (RA): Allah's Messenger (ﷺ) said: "Every loan, which leads to a benefit, is usury." [al-Harith bin Abu Usamah reported it, but its chain of narrators is Saaqit (containing an extremely weak narrator)].
Sunnah.com reference: Book 7, Hadith 99