(54) باب مَا يُذْكَرُ فِي بَيْعِ الطَّعَامِ وَالْحُكْرَةِ
Narrated Tawus:
Ibn `Abbas said, "Allah's Messenger (ﷺ) forbade the selling of foodstuff before its measuring and transferring into one's possession." I asked Ibn `Abbas, "How is that?" Ibn `Abbas replied, "It will be just like selling money for money, as the foodstuff has not been handed over to the first purchaser who is the present seller."
Reference: Sahih al-Bukhari 2132
In-book reference: Book 34, Hadith 84
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 342