al-Aswad bin Yazid الأسود بن يزيد بن قيس النخعي · The Book on Business

"Zaid, Abu Ayyash asked Sa'd regarding white wheat in exchange for barley: which of them was better ? He said the white, then he forbade that. Sa'd said: 'I heard the Messenger of Allah (ﷺ) being asked about selling dried dates for ripe dates and he said to those present: "Will the fresh dates shrink when they are dry ?" They said yes, so he forbade that.'"

That the Prophet (ﷺ) said: "They (the two) are not separate from a sale except in agreement. This Hadith is Gharib.