(32) باب بَيْعِ الثَّمَرِ بِالتَّمْرِ
It was narrated from Ibn 'Umar that:
the Messenger of Allah forbade Muzabanah. Ad Muzabanah is when what is art the tops of the trees is sold for a certain amount f dried dates; if there are more then I gain, and if there are less the I lose.
Reference: Sunan an-Nasa'i 4533
In-book reference: Book 44, Hadith 85
English translation: Vol. 5, Book 44, Hadith 4537