8. Al-Fiusayn from Muhammad has narrated from Mu’alla’ ibn Muhammad and Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad all from al-Washsha’ who has said the following:

“I once asked al-Rida’ , about the case of a man who bought a certain piece of land from another man in exchange for one hundred Kur (a certain unit of measurement) to be paid from the land. He (the Imam) said, ‘It is unlawful.’ I then asked, ‘I pray to Allah to keep my soul in service for your cause, what do you say if I buy from him the land for a known measure of wheat from other sources. He (the Imam) said, ‘It is not unlawful.’”