Shaykh Abu Ayash narrates that during the time of Sayyiduna Sa’d, people made a transaction involving two types of barley. Sayyiduna Sa’d said: In the blessed time of the Prophet Muhammad (peace be upon him), two men made a transaction of dry and fresh dates. The Prophet Muhammad (peace be upon him) asked:“When the dates become dry, do they decrease (in quantity)?”The people replied:“Yes.”So the Prophet Muhammad (peace be upon him) said:“(Then this is not permissible).”