(11) Business Transactions
كتاب البيوع
(5b) Chapter: Business Transactions which are Forbidden - Section 2
(5) باب المنهي عنها من البيوع - الفصل الثاني
Mishkat al-Masabih 2868 
Abu Huraira said God’s Messenger forbade two transactions combined in one (Making part-payment with the promise of the remainder later:
or selling an article for a stated price on condition that the buyer sells article for a stated price. Malik, Tirmidhi, Abu Dawud and Nasa‘i transmitted it.
وَعَنْ أَبِي هُرَيْرَةَ قَالَ: نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ بَيْعَتَيْنِ فِي بيعةٍ. رَوَاهُ مَالك وَالتِّرْمِذِيّ وَالنَّسَائِيّ
 صَحِيح  (الألباني)حكم :
Reference : Mishkat al-Masabih 2868
In-book reference : Book 11, Hadith 106