عَنْ صُهَيْبٍ رضى الله عنه
أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «ثَلَاثٌ فِيهِنَّ اَلْبَرَكَةُ: اَلْبَيْعُ إِلَى أَجَلٍ، وَالْمُقَارَضَةُ، وَخَلْطُ اَلْبُرِّ بِالشَّعِيرِ لِلْبَيْتِ، لَا لِلْبَيْعِ»
The Prophet (sallallahu alayhi wa sallam) said: “There are three things which contain blessings: A business transaction in which payment is agreed on a fixed later time, al-Muqaradah (speculative partnership), and mixing wheat and barley for one’s household use but not for sale.”.