Ibn ‘Abbas said what the Prophet forbade was that grain should be sold before it had been received. Ibn ‘Abbas said, “I do not think this applies to every commodity, but only to things of that type.” (Bukhari and Muslim.)
Hadith Referenceمشكوة المصابيح / كتاب البيوع / 2846
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (2135) و مسلم (1525/29)»