In Matthew Chapter 27, Verses 52-53 King James,
And the graves were opened; and many bodies of the Saints which slept arose (53) And came out of the graves after His resurrection, and went into the holy city, and appeared unto many.
This is all given about the subject, since none of the other gospels mention this event. Though I know it wasn't a sort of soul sleep, it still confuses me on why they rose from the grave. Does anyone know?