The Prophet ﷺ forbade the selling of fruits unless they get ripe, and none of them should be sold except for Dinar or Dirham (i.e. money), except the 'Araya trees (the dates of which could be sold for dates).  

نَهَى النَّبِيُّ ﷺ عَنْ بَيْعِ الثَّمَرِ حَتَّى يَطِيبَ وَلاَ يُبَاعُ شَىْءٌ مِنْهُ إِلاَّ بِالدِّينَارِ وَالدِّرْهَمِ إِلاَّ الْعَرَايَا  

The Prophet ﷺ allowed the sale of the dates of 'Araya provided they were about five Awsuq (singular: Wasaq which means sixty Sa's) or less (in amount).  

أَنَّ النَّبِيَّ ﷺ رَخَّصَ فِي بَيْعِ الْعَرَايَا فِي خَمْسَةِ أَوْسُقٍ أَوْ دُونَ خَمْسَةِ أَوْسُقٍ قَالَ نَعَمْ  

Messenger of Allah ﷺ forbade the selling of fruits (fresh dates) for dried dates but allowed the sale of fruits on the 'Araya by estimation and their new owners might eat their dates fresh. Sufyan (in another narration) said, "I told Yahya (a sub-narrator) when I was a mere boy, 'Meccans say that the Prophet ﷺ allowed them the sale of the fruits on 'Araya by estimation.' Yahya asked, 'How do the Meccans know about it?' I replied, 'They narrated it (from the Prophet ﷺ ) through Jabir.' On that, Yahya kept quiet." Sufyan said, "I meant that Jabir belonged to Medina." Sufyan was asked whether in Jabir's narration there was any prohibition of selling fruits before their benefit is evident (i.e. no dangers of being spoilt or blighted). He replied that there was none.  

أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنْ بَيْعِ الثَّمَرِ بِالتَّمْرِ وَرَخَّصَ فِي الْعَرِيَّةِ أَنْ تُبَاعَ بِخَرْصِهَا يَأْكُلُهَا أَهْلُهَا رُطَبًا وَقَالَ سُفْيَانُ مَرَّةً أُخْرَى إِلاَّ أَنَّهُ رَخَّصَ فِي الْعَرِيَّةِ يَبِيعُهَا أَهْلُهَا بِخَرْصِهَا يَأْكُلُونَهَا رُطَبًا قَالَ هُوَ سَوَاءٌ قَالَ سُفْيَانُ فَقُلْتُ لِيَحْيَى وَأَنَا غُلاَمٌ إِنَّ أَهْلَ مَكَّةَ يَقُولُونَ إِنَّ النَّبِيَّ ﷺ رَخَّصَ فِي بَيْعِ الْعَرَايَا فَقَالَ وَمَا يُدْرِي أَهْلَ مَكَّةَ قُلْتُ إِنَّهُمْ يَرْوُونَهُ عَنْ جَابِرٍ فَسَكَتَ قَالَ سُفْيَانُ إِنَّمَا أَرَدْتُ أَنَّ جَابِرًا مِنْ أَهْلِ الْمَدِينَةِ قِيلَ لِسُفْيَانَ وَلَيْسَ فِيهِ نَهْىٌ عَنْ بَيْعِ الثَّمَرِ حَتَّى يَبْدُوَ صَلاَحُهُ قَالَ لاَ