It is narrated from Abu al-Zubayr al-Makki that he said: I heard Sayyiduna Abu Usayd al-Sa'idi (may Allah be pleased with him) while Sayyiduna Ibn Abbas (may Allah be pleased with them both) was giving a verdict that one dinar for two dinars (is permissible). Abu Usayd al-Sa'idi spoke harshly to him. Ibn Abbas said: "O Abu Usayd, I did not think that anyone who knows my kinship with the Messenger of Allah (peace and blessings be upon him) would say such a thing to me." Abu Usayd said: "I bear witness that I heard the Messenger of Allah (peace and blessings be upon him) say: 'A dinar for a dinar, a dirham for a dirham, a sa' of wheat for a sa' of wheat, a sa' of barley for a sa' of barley, and a sa' of salt for a sa' of salt (are to be sold equally); there is to be no excess between them in any of these.'" On hearing this, Ibn Abbas said: "This was only something I used to say from my own opinion; I had not heard anything about it." This hadith is sahih (authentic) on the condition of Muslim, but the two Shaykhs did not record it with this wording. Atiq bin Ya'qub is a Qurashi shaykh from the people of Madinah.