Al-Îzâh fi`l-Khayr al-Makhz (Liber de Causis) alongside with Asologia (Theologia of Aristoteles) is one of the important sources that determine the contents and purposes of metaphysics in Islamic philosophy. Although it actually reflects the Proclosian form of Neo-Platonism it was falsely attributed to Aristoteles. Al-Îzâh was a major source through which Neo-Platonism was transmitted to the Islamic world. It is comprised of 31 one sections that discuss or formulate at different levels the various subjects that we are acquianted with in philosophy texts written in Arabic. In this article, I have discussed some new materials on the anonymous Îzâh al-khair, which appeared in a group of “resâil” extant among Avempacean, or, perhaps, pseudo-Avempacean writings. These “resâil” show that there was a different version of al-Îzâh fî al-khair al-mahd in Arabic. On the other hand, I have tried to show that there was another reader of al-Îzâh among philosophers of Islam in the medieval period of Islam.