The Prophet ﷺ forbade the sale of fruits till their benefit is evident; and the sale of date palms till the dates are almost ripe. He was asked what 'are almost ripe' meant. He replied, "Got red and yellow."  

عَنِ النَّبِيِّ ﷺ أَنَّهُ نَهَى عَنْ بَيْعِ الثَّمَرَةِ حَتَّى يَبْدُوَ صَلاَحُهَا وَعَنِ النَّخْلِ حَتَّى يَزْهُوَ قِيلَ وَمَا يَزْهُو قَالَ يَحْمَارُّ أَوْ يَصْفَارُّ  

What does the word" mellow" mean? He said: (There the fruit) turns red or yellow. Don't you see if Allah had checked (the growth of) fruits; then what for the wealth of your brother would be permissible for you?  

أَنَّ النَّبِيَّ ﷺ نَهَى عَنْ بَيْعِ ثَمَرِ النَّخْلِ حَتَّى تَزْهُوَ فَقُلْنَا لأَنَسٍ مَا زَهْوُهَا قَالَ تَحْمَرُّ وَتَصْفَرُّ أَرَأَيْتَكَ إِنْ مَنَعَ اللَّهُ الثَّمَرَةَ بِمَ تَسْتَحِلُّ مَالَ أَخِيكَ  

[Machine] The Messenger of Allah ﷺ prohibited selling the dates until they ripen. Anas was asked, "What does it mean to ripen?" He replied, "Until they turn red."  

نَهَى رَسُولُ اللهِ ﷺ عَنْ بَيْعِ ثَمَرَةِ النَّخْلِ حَتَّى تَزْهُوَ قِيلَ لِأَنَسٍ مَا تَزْهُو؟ قَالَ تَحْمَرُّ