The Book of Financial Transactions

It was narrate from Abu Salih that:

a man form among the companions of the Prophet (ﷺ) told him, he said: "O Messenger of Allah we cannot buy Saihani dates or 'idhq dates for the same amount of mixed dates (which are of inferior quality). Should we increase (the amount we give in payment for the better quality dates)?" The messenger of Allah said: "Sell them for silver them buy with it"