Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) "forbade selling (fruit) for years ahead and ordered that the price be reduced on account of calamity."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10628
Imam al-Shafi'i (may Allah have mercy on him) says: I heard this hadith from Sufyan (may Allah have mercy on him) very many times, more than I can count. He would not mention the reduction of the price in it, and would add nothing beyond that the Prophet (peace and blessings be upon him) "forbade selling fruits for years ahead"; then after that he added that he (peace and blessings be upon him) "ordered that the price be reduced on account of drought."
(b) Sufyan (may Allah have mercy on him) says that after the sale for years and before the reduction of the price for calamity, Humayd (may Allah have mercy on him) used to mention some words which I did not remember, so I would refrain from mentioning the reduction of the price, because I did not know what those words were, although the hadith contains the order to reduce the price for calamities. Imam al-Shafi'i (may Allah have mercy on him) says: It may be that the words of Humayd's hadith which Sufyan (may Allah have mercy on him) did not remember indicate that his (peace and blessings be upon him) order to reduce the price is like his order to settle on half, or his order to give voluntary charity, an encouragement towards good, not an obligation, or something similar; and something else is also possible.
Since the hadith carries both meanings, and there is no indication in it of which of the two is more fitting, it is not permissible in our view, and Allah knows best, to rule against people in their wealth that they must give up what is due to them, without an established report that it be given up.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10629
It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that he (peace and blessings be upon him) spoke about reducing the price (on account of calamities).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10630
Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) said: "If you sell fruit to your brother and it is struck by a calamity, then it is not lawful for you to take anything from him. How would you take your brother's wealth without right?"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10631
Abdullah bin Wahb (may Allah have mercy on him) mentions the like of it, that he (peace and blessings be upon him) said: "It is not lawful for you to take anything of its price."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10632
Sayyiduna Jabir (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "How will you take your brother's wealth when a calamity from the sky has struck it?"
(b) The hadith of Abu al-Zubayr from Sayyiduna Jabir (may Allah be pleased with him), even if it was not reported concerning the sale of fruits before they ripen, like the hadith of Malik from Humayd from Anas (may Allah be pleased with him), is explicit that taking the price is forbidden when a calamity strikes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10633