as above, saying, "He should pay the price in advance for a specified measure and for a specified period."
Sahih al-Bukhari Book 35, Hadith 4
← Previous Hadith The Prophet (ﷺ) came to Medina and the people used to pay in advance the price of dates to be delivered within two or three years. He said (to them), "Whoever pays in advance the price of a thing to be delivered later should pay it for a specified measure at specified weight for a specified period."

Sahih al-Bukhari Book 35, Hadith 3 Next Hadith → The Prophet (ﷺ) 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.

Sahih al-Bukhari Book 35, Hadith 5