Narrated Ibn `Abbas: The Prophet came (to Medina) and he told the people (regarding the payment of money in advance that they should pay it) for a known specified measure and a known specified weight and a known specified period.
Hadith ReferenceSahih Bukhari / The Book of As-Salam / Hadith: 2241
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة