(55) باب بَيْعِ الطَّعَامِ قَبْلَ أَنْ يُقْبَضَ، وَبَيْعِ مَا لَيْسَ عِنْدَكَ
Narrated Ibn `Abbas:
The Prophet (ﷺ) forbade the selling of foodstuff before receiving it. I consider that all types of sellings should be done similarly.
Reference: Sahih al-Bukhari 2135
In-book reference: Book 34, Hadith 87
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 345