In verse 172, Aaraf Sura, God covenants with its thrall (servants); but this verse expressed a general concept and did not discuss the details. This resulted in suggesting different views and comments by mystics, scholars, theologians, commentators and jurists. They explicitly pointed to some of the cases of this eternal covenant, such as testament of Adam, confession of people to God and saying "yes" by Adam to God; but commentators and mystics had different and contradictory perceptions. This study analyzed the process of concept formation and different thoughts of "eternity" from the first commentator to the books of Persian literature mystics, and offers a comprehensive and detailed discussion of the issue