question #1 Sahih al-Bukhari 2241, Book 35, Hadith 5 : What guidelines did the Prophet (ﷺ) provide regarding the payment of money in advance?

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.