حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، وَعَمْرٌو النَّاقِدُ، - وَاللَّفْظُ لِيَحْيَى قَالَ عَمْرٌو حَدَّثَنَا وَقَالَ يَحْيَى - أَخْبَرَنَا سُفْيَانُ بْنُ عُيَيْنَةَ عَنِ ابْنِ أَبِي نَجِيحٍ عَنْ عَبْدِ اللَّهِ بْنِ كَثِيرٍ عَنْ أَبِي الْمِنْهَالِ عَنِ ابْنِ عَبَّاسٍ قَالَ قَدِمَ النَّبِيُّ صلى الله عليه وسلم الْمَدِينَةَ وَهُمْ يُسْلِفُونَ فِي الثِّمَارِ السَّنَةَ وَالسَّنَتَيْنِ فَقَالَ " مَنْ أَسْلَفَ فِي تَمْرٍ فَلْيُسْلِفْ فِي كَيْلٍ مَعْلُومٍ وَوَزْنٍ مَعْلُومٍ إِلَى أَجَلٍ مَعْلُومٍ" .
Ibn 'Abbas (Allah be pleased with them) reported that when Allah's Prophet (PBUH) came to Medina, they were paying one and two years in advance for fruits, so he said: Those who pay in advance for anything must do so for a specified weight and for a definite time. Translation Not Available
Book Ref: Sahih Muslim Book 22 Hadith 3906
Web Ref: Sahih Muslim Book 10 Hadith 1604 a