"raised him from among those who were dead." To be with "the dead" means to be dead. To raise up is an idiom for causing someone who has died to become alive again. Alternate translation: "caused him to live again" (See: [[rc://en/ta/man/translate/figs-idiom]])
From among all those who have died. This expression describes all dead people together in the underworld. To raise someone from among them speaks of making that person alive again.