وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي الرِّجَالِ، مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ حَارِثَةَ عَنْ أُمِّهِ، عَمْرَةَ بِنْتِ عَبْدِ الرَّحْمَنِ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنْ بَيْعِ الثِّمَارِ حَتَّى تَنْجُوَ مِنَ الْعَاهَةِ ‏.‏ قَالَ مَالِكٌ وَبَيْعُ الثِّمَارِ قَبْلَ أَنْ يَبْدُوَ صَلاَحُهَا مِنْ بَيْعِ الْغَرَرِ ‏.‏

Yahya related to me from Malik from Abu'r-Rijal Muhammad ibn Abdar-Rahman ibn Haritha from his mother, Amra bint Abd ar-Rahman thatthe Messenger of Allah, may Allah bless him and grant him peace,forbade selling fruit until it was clear of blight. Malik said,"Selling fruit before it has begun to ripen is an uncertaintransaction (gharar) ." Translation Not Available

Book Ref: Muwatta Imam Malik Book 31 Hadith 1304
Web Ref:  Muwatta Imam Malik Book 31 Hadith 12