Narrated Anas bin Malik (RA):

The Prophet (ﷺ) forbade the sale of grapes till they become black (i.e. ripe) and the sale of grain till it becomes hard (i.e. ripe). [Reported by al-Khamsah except an-Nasa'i and graded Sahih (authentic) by Ibn Hibban and al-Hakim].

وَعَنْ أَنَسِ بْنِ مَالِكٍ ‏- رضى الله عنه ‏- { أَنَّ اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-نَهَى عَنْ بَيْعِ اَلْعِنَبِ حَتَّى يَسْوَدَّ, وَعَنْ بَيْعِ اَلْحَبِّ حَتَّى يَشْتَدَّ } رَوَاهُ اَلْخَمْسَةُ, إِلَّا النَّسَائِيَّ, وَصَحَّحَهُ اِبْنُ حِبَّانَ, وَالْحَاكِمُ [1]‏ .‏