Mishkat al-Masabih 2840
Anas said that God’s Messenger forbade the sale of fruits till tuzhiya. He was asked what that meant and said it meant till they became red, adding, “Tell me:
when God keeps back the fruit, why should any of you take his brother’s property?” 

(Bukhari and Muslim.)
وَعَنْ أَنَسٍ قَالَ: نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَن بيع الثِّمَارِ حَتَّى تَزْهَى قِيلَ: وَمَا تَزْهَى؟ قَالَ:
حَتَّى تخمر " وَقَالَ: «أَرَأَيْتَ إِذَا مَنَعَ اللَّهُ الثَّمَرَةَ بِمَ يَأْخُذ أحدكُم مَال أَخِيه؟»