Sunan an-Nasa'i 4631
سنن النسائي#4631Sahihأَخْبَرَنَا مُحَمَّدُ بْنُ رَافِعٍ، قَالَ حَدَّثَنَا عَبْدُ الرَّزَّاقِ، قَالَ حَدَّثَنَا مَعْمَرٌ، عَنْ أَيُّوبَ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ سَلَفٍ وَبَيْعٍ وَعَنْ شَرْطَيْنِ فِي بَيْعٍ وَاحِدٍ وَعَنْ بَيْعِ مَا لَيْسَ عِنْدَكَ وَعَنْ رِبْحِ مَا لَمْ يُضْمَنْ .
It was narrated from 'Amr bin Shu'aib, from his father, that his grandfather said:"The Messenger of Allah forbade lending on the condition of a sale, selling what you do not have, and profiting on what you do not possess
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 44:183