It was narrated from Abu Barzah Al-Aslami that the Messenger of Allah (ﷺ) said:
"The two parties to a transaction have the choice (of annulling it) so long as they have not yet parted." (TR)
English reference (TR): Vol. 3, Book 12, Hadith 2182 (TR)
Arabic reference (TR): Book 12, Hadith 2266 (TR)