Narrated Ibn `Umar: The Prophet said, "No deal is settled and finalized unless the buyer and the seller separate, except if the deal is optional (whereby the validity of the bargain depends on the stipulations agreed upon).
Hadith ReferenceSahih Bukhari / The Book of Sales (Bargains) / Hadith: 2113
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة