[Abu 'Eisa said:] 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 to speech, and there was no option left for him after the sale, then this Hadith would be meaningless, since he (ﷺ) said: "And it is not lawful for him to separate from his companion, fearing that he will change his mind."
In-book : Book 14, Hadith 47
English translation : Vol. 1, Book 12, Hadith 1247