بُلُوغُ الْمَرَامِ
Bulugh al-Maram 846
Business Transactions
وَعَنِ اِبْنِ عُمَرَ -رَضِيَ اَللَّهُ عَنْهُمَا-; { أَنَّ اَلنَّبِيَّ - صلى الله عليه وسلم -نَهَى عَنْ بَيْعِ اَلْكَالِئِ بِالْكَالِئِ, يَعْنِي: اَلدَّيْنِ بِالدَّيْنِ } رَوَاهُ إِسْحَاقُ, وَالْبَزَّارُ بِإِسْنَادٍ ضَعِيفٍ [1] .
Narrated Ibn 'Umar (RA): The Prophet (ﷺ) forbade selling a debt to be paid at a future date for another i.e., a debt for a debt. [Reported by Ishaq and al-Bazzar with a Da;if (weak) chain].
Sunnah.com reference: Book 7, Hadith 80