"Whoever sells fruits then the crop fails, should not take any of his brother's money. Why would any of you take the money of his Muslim brother?"
Sunan Ibn Majah Book 12, Hadith 83
← Previous Hadith the Messenger of Allah (ﷺ) forbade selling for many years ahead.

Sunan Ibn Majah Book 12, Hadith 82 Next Hadith → "Makhrafah Al' Abdi and I brought linens from Hajar The Messenger of Allah (ﷺ) came to us to bargain with us with some trousers. There was someone with me who weighed (the goods) in exchange for a wage. So the Prophet (ﷺ) said to the one weighing: 'Weigh and add more.'"

Sunan Ibn Majah Book 12, Hadith 84