Messenger of Allah ﷺ said, "Do not urge somebody to return what he has already bought (i.e. in optional sale) from another seller so as to sell him your own goods." (Using translation from Bukhārī 2139)   

عَنِ النَّبِيِّ ﷺ قَالَ «لَا يَبِيعُ أَحَدُكُمْ عَلَى بَيْعِ بَعْضٍ»  

"Do not urge someone to cancel a sale he has already agreed upon so as to sell him your own goods, unless he bys or changes his mind." (Using translation from Nasāʾī 4504)  

عَنْ رَسُولِ اللهِ ﷺ قَالَ «لَا يَبِيعُ الرَّجُلُ عَلَى بَيْعِ أَخِيهِ حَتَّى يَبْتَاعَ أَوْ يَذَرَ»