Sunan an-Nasa'i 4611
سنن النسائي#4611Sahihأَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، وَحُمَيْدُ بْنُ مَسْعَدَةَ، عَنْ يَزِيدَ، قَالَ حَدَّثَنَا أَيُّوبُ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ يَحِلُّ سَلَفٌ وَبَيْعٌ وَلاَ شَرْطَانِ فِي بَيْعٍ وَلاَ بَيْعُ مَا لَيْسَ عِنْدَكَ " .
It was narrated from'Amr bin Shu'aib, from his father that his grandfather, Said:that the Messenger of Allah said: "It is not permissible to lend on the condition of a sale, or to have two conditions in one transaction, or to sell what you do not have." (Sahih)
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: 44:163