Musannaf Ibn Abi Shayba 13:738

Abu Bakr narrated to us, he said: Abu Dawud al-Tayalisi narrated to us, from Za'idah ibn Qudamah, from Simak, from Ikrimah, from Ibn Abbas, that he disliked [the exchange of] fresh dates for dried dates. And he said: "It is the lesser of the two in measurement, or in the qafiz."