´It was narrated from Ibn 'Umar that the Messenger of Allah (ﷺ) said:` "Do not sell fruits until they have ripened." And he forbade (both) the seller and the purchaser (to engage in such a transaction).
Hadith ReferenceSunan Ibn Majah / The Chapters on Business Transactions / Hadith: 2214
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده صحيح