Raj’ah is a Shia Imamiyyah doctrine, which refers to the return of some of the dead to this world before the Day of Judgment and a little after the rise and emergence of Imam Mahdi (as) and before his martyrdom.

The Raj’ah isn't something general that takes place for everyone, it only belongs to those who are complete in faith and those who have the highest levels of evilness and shirk.