حَدَّثَنَا عَفَّانُ حَدَّثَنَا عَبْدُ الْوَارِثِ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ أَبِي نَجِيحٍ عَنْ عَبْدِ اللَّهِ بْنِ كَثِيرٍ عَنْ أَبِي الْمِنْهَالِ عَنِ ابْنِ عَبَّاسٍ قَالَ قَدِمَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَهُمْ يُسْلِفُونَ فَقَالَ مَنْ أَسْلَفَ فَلَا يُسْلِفْ إِلَّا فِي كَيْلٍ مَعْلُومٍ وَوَزْنٍ مَعْلُومٍ
مسند امام احمد بن حنبل · Hadith 2548
It was narrated that Ibn 'Abbas (RA) said: When the Messenger of Allah (PBUH) came [to Madinah] they used to pay in advance for crops. He said: "Who- ever pays in advance, let him not pay in advance except for a known measure and a known weight."
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020