the Prophet forbade selling the harvest for a number of years (in advance.)
Sunan an-Nasa'i Book 44, Hadith 83
← Previous Hadith "At the time of the Messenger of Allah, a ma suffered loss of some fruit that he had purchased, and his debts increased. The Messenger of Allah said: 'give him charity.' So the people gave him charity, but that was not enough to pay of his debts. The Messenger of Allah said: "Take what you find but you have no right to or than that.""

Sunan an-Nasa'i Book 44, Hadith 82 Next Hadith → the Prophet forbade selling fresh dates still on the tree for dried dates. Ibn 'Umar said: "Azid bin Thabit narrated to me, that Allah's Messenger permitted that in the case o 'Ayaya"'

Sunan an-Nasa'i Book 44, Hadith 84