And 'Ali ibn Hujr al-Sa'di and Zuhayr ibn Harb narrated to me, both saying: Isma'il narrated to us, from Ayyub, from Nafi', from Ibn 'Umar, that the Messenger of Allah, peace and blessings be upon him, forbade the sale of palm trees until they ripened, and the sale of ears of grain until they whitened and were safe from blight. He forbade both the seller and the buyer.