The Messenger of Allah said: "The two parties to a transaction have the choice so long as they have not separated. If they are honest and open, their transaction will be blessed, but if they tell lies and conceal anything the blessing of their transaction will be lost." (Using translation from Nasāʾī 4464)  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «الْبَيِّعَانِ بِالْخِيَارِ مَا لَمْ يَتَفَرَّقَا فَإِنْ صَدَقَا وَبَيَّنَا بُورِكَ لَهُمَا فِي بَيْعِهِمَا وَإِنْ كَذَبَا وَكَتَمَا مُحِقَ بَرَكَةُ بَيْعِهِمَا»  

[Machine] About Qatadah with his chain of narration, similar to it.  

عَنْ قَتَادَةَ بِإِسْنَادِهِ مِثْلَهُ