Musannaf Ibn Abi Shaybah 21946 — Buying fresh dates for dried dates

Zayd Abu Ayyash said: I asked Sayyiduna Sa'd (may Allah be pleased with him) whether white hulled barley may be taken in exchange for corn. He disliked it and said: The Messenger of Allah (peace and blessings be upon him) was asked whether fresh dates may be sold in exchange for dried dates. He asked: Do fresh dates decrease after they dry? The people answered yes, so he disliked it.