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
[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
[Machine] The Messenger of Allah ﷺ forbade selling fruits or palm trees until their goodness becomes apparent.
نَهَى رَسُولُ اللهِ ﷺ عَنْ بَيْعِ الثَّمَرِ أَوِ النَّخْلِ حَتَّى يَبْدُوَ صَلَاحُهُ
"نَهَى النَّبيُّ ﷺ عَنْ بَيْع ثَمَرِ النَّخْلِ حَتَّى يَزْهُوَ، فَقِيلَ لأنَسٍ مَا زهوُّهُ؟ قَالَ: يَحْمَرُّ أوْ يَصْفَرُّ".