Yahya bin Qais Mazni says: I asked Imam Ata whether, when trading dinar for dinar and dirham for dirham, there can be any increase or decrease. He said: Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) considered it permissible. Sayyiduna Ibn Zubair (may Allah be pleased with them both) said: Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates matters which he did not himself hear from the Messenger of Allah (peace and blessings be upon him). When this reached him, he said: Indeed, I did not myself hear this hadith from the Messenger of Allah (peace and blessings be upon him), but Sayyiduna Usama bin Zaid (may Allah be pleased with them both) narrated to me that the Messenger of Allah (peace and blessings be upon him) said that there is no usury except in credit.