عَنْ صُهَيْبٍ ‏- رضى الله عنه ‏- أَنَّ اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-قَالَ: { ثَلَاثٌ فِيهِنَّ اَلْبَرَكَةُ: اَلْبَيْعُ إِلَى أَجَلٍ، وَالْمُقَارَضَةُ، وَخَلْطُ اَلْبُرِّ بِالشَّعِيرِ لِلْبَيْتِ, لَا لِلْبَيْعِ } رَوَاهُ اِبْنُ مَاجَهْ بِإِسْنَادٍ ضَعِيفٍ 1‏ .‏‏1 ‏- ضعيف.‏ رواه ابن ماجه ( 2289 )‏.‏

The Prophet (ﷺ) 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." .