Amr bin Dinar said: I was with Abu al-Minhal, and he was saying: A partner of mine in Kufah sold dirhams for dirhams with a difference between them, so I said: I do not think this is proper. He (the partner) said: I sold them in the market and no one objected to me. So I went to Sayyiduna al-Bara' bin Azib (may Allah be pleased with him) and asked him, and he said: the Prophet (peace and blessings be upon him) came to Madinah while our trade was like this, and he (peace and blessings be upon him) said: "Whatever is hand to hand, there is no harm in it, and whatever is on deferred payment, there is no good in it." Then I went to Sayyiduna Zayd bin Arqam (may Allah be pleased with him), for he was a bigger trader than me, and mentioned this to him, and he said: Al-Bara' spoke the truth.
Al-Humaydi said: "This (ruling) is abrogated; it is not acted upon."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 450