Sunan an-Nasa'i, Volume 5, Book 44, Hadith 4529 (DarusSalam) ⓘ
It was narrated that Jabir said: "the Messenger of Allah forbade selling the fruit of date palms until they are fit to eat."
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا هِشَامٌ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ بَيْعِ النَّخْلِ حَتَّى يُطْعَمَ .
also referenced under: Hadith 4525 (Reference) & Book 44, Hadith 77 (In-Book)