We were on a journey, and Abu Barza was with us. Abu Barza said that the Messenger of Allah ﷺ said, "The buyer and seller each have the option to cancel the transaction as long as they have not parted."
حدثنا أبو كامل حدثنا حماد بن زيد عن جميل بن مرة
كنا في سفر ومعنا أبو برزة فقال أبو برزة إن رسول الله ﷺ قال البيعان بالخيار ما لم يتفرقا
Its chain of transmission is sahih. Jameel bin Murrah Shaybani is reliable, and his hadith appears in the Sunan collections. Abu Rabi Madani was deemed reliable by Ibn Hibban, and Abu Hatim considered him acceptable. The hadith has already appeared at 15513.