Sahih Muslim Book - 21, Hadith - 3896

حَدَّثَنِى يَحْيَى بْنُ مَعِينٍ وَهَارُونُ بْنُ عَبْدِ اللَّهِ وَحُسَيْنُ بْنُ عِيسَى قَالُوا حَدَّثَنَا أَبُو أُسَامَةَ حَدَّثَنَا عُبَيْدُ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ نَهَى رَسُولُ اللَّهِ -صلى الله عليه وسلم- عَنِ الْمُزَابَنَةِ وَالْمُزَابَنَةُ بَيْعُ ثَمَرِ النَّخْلِ بِالتَّمْرِ كَيْلاً وَبَيْعُ الزَّبِيبِ بِالْعِنَبِ كَيْلاً وَعَنْ كُلِّ ثَمَرٍ بِخَرْصِهِ.

It was narrated that Ibn 'Umar said: "The Messenger of Allah (s.a.w) forbade Muzabanah. Muzabanah means selling the produce of palm trees for dried dates by measure, or selling grapes for raisins by measure, or selling any kind of produce for an estimated measure of the same kind of produce."