I asked Ibn ʿUmar and said: I am only asking you about two things: about salam (forward sale) of the date palm trees, and about the raisin and dates [mixture].
So he said that an intoxicated man was brought to the Messenger of Allah ﷺ who had drank a raisin and date mixture. He said that he was whipped according to the prescribed penalty and [thr Prohpet] forbade mixing of the two.
And a man sold a forward sale of date palms to another man, however, it did not bear any of its dates. He came asking for them but he refused to give him [his due]. They then came to the Prophet ﷺ so he said, “Did you date palms bear any fruit?”. He said: No. Then he said, “Why are you then consuming his wealth?” He said that [the Prophet] then ordered him and invalidated the sale and forbade the forward sale of date palms unless they have begun to bear fruit.
سَأَلْتُ ابْنَ عُمَرَ قُلْتُ إِنَّمَا أَسْأَلُكَ عَنْ شَيْئَيْنِ عَنِ السَّلَمِ فِي النَّخْلِ وَعَنِ الزَّبِيبِ وَالتَّمْرِ:
فَقَالَ: أُتِيَ رَسُولُ اللهِ ﷺ بِرَجُلٍ نَشْوَانَ قَدْ شَرِبَ زَبِيبًا وَتَمْرًا. قَالَ: فَجَلَدَهُ الْحَدَّ وَنَهَى أَنْ يُخْلَطَا.
قَالَ: وَأَسْلَمَ رَجُلٌ فِي نَخْلِ رَجُلٍ فَلَمْ يَحْمِلْ نَخْلُهُ. قَالَ: فَأَتَاهُ يَطْلُبُهُ، قَالَ: فَأَبَى أَنْ يُعْطِيَهُ. قَالَ: فَأَتَيَا النَّبِيَّ ﷺ فَقَالَ: «أَحَمَلَتْ نَخْلُكَ؟» قَالَ: لَا. قَالَ: «فَبِمَ تَأْكُلُ مَالَهُ؟» قَالَ: فَأَمَرَهُ فَرَدَّ عَلَيْهِ وَنَهَى عَنِ السَّلَمِ فِي النَّخْلِ حَتَّى يَبْدُوَ صَلَاحُهُ.