Khalid bin Abi 'Imran خالد بن أبي عمران · The Book on Business

From his father, from his grandfather, that the Messenger of Allah (ﷺ) said: "Both the buyer and the seller retain the option as long as they did not separate, unless they agreed to making it optional. And it is not lawful for him to separate from his companion, fearing that he will change his mind." This Hadith is Hasan and this means separating from him after the sale, fearing that he will change his mind. And if the separation referred…