The Messenger of Allah ﷺ forbade to sell fresh dates for dry dates when payment is made at a later date. Abu Dawud said: The tradition mentioned above has also been transmitted by Sa'd (b. Abi Waqqas) from the Prophet ﷺ through a different chain of narrators in a similar way.
أَخْبَرَهُ أَنَّهُ سَمِعَ سَعْدَ بْنَ أَبِي وَقَّاصٍ يَقُولُ نَهَى رَسُولُ اللَّهِ ﷺ عَنْ بَيْعِ الرُّطَبِ بِالتَّمْرِ نَسِيئَةً