عَن صُهَيْبٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:
" ثَلَاثٌ فِيهِنَّ الْبَرَكَةُ: الْبَيْعُ إِلَى أَجَلٍ والمقارضة واخلاط الْبُرِّ بِالشَّعِيرِ لِلْبَيْتِ لَا لِلْبَيْعِ ". رَوَاهُ ابْنُ مَاجَه
A business transaction with a time specified, muqarada* and mixing wheat and barley for one’s household but not for sale.”
Ibn Majah transmitted it.
* Giving someone some property to trade with, the profit being shared between the two, but any loss falling on the property.