Anas said that God's Messenger forbade the sale of grapes till they became black and the sale of grain till it had become hard. Thus Tirmidhi and Abu Dawud transmitted it from Anas. The addition which is in al-Masabih, viz., his saying that he forbade the sale of dates till they became ripe, occurs only in their version from Ibn ‘Umar who said that he forbade the sale of palm-trees till the fruit was ripe.
Tirmidhi said this is a hasan gharib tradition.