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