If somebody sells fruits before their benefit is evident Sahih al-Bukhari 2198
Arabic hadith text
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ حُمَيْدٍ، عَنْ أَنَسِ بْنِ مَالِكٍ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنْبَيْعِ الثِّمَارِ حَتَّى تُزْهِيَ. فَقِيلَ لَهُ وَمَا تُزْهِي قَالَ حَتَّى تَحْمَرَّ. فَقَالَ " أَرَأَيْتَ إِذَا مَنَعَ اللَّهُ الثَّمَرَةَ، بِمَ يَأْخُذُ أَحَدُكُمْ مَالَ أَخِيهِ ".
Translation
Narrated Anas bin Malik
Allah's Messenger (ﷺ) forbade the sale of fruits till they are almost ripe. He was asked what is meant by 'are almost ripe.' He replied, "Till they become red." Allah's Messenger (ﷺ) further said, "If Allah spoiled the fruits, what right would one have to take the money of one's brother (i.e. other people)?"