A temporary holding place for OT believers until Christ actually paid for their sins on the cross. The key concept here is fellowship, good fellowship with family. This brotherly fellowship is an element of heaven, and this place is a part of Sheol (Seol), the place of the dead. This “chamber” of Sheol is for those who are saved, believing in the Messiah before he came. Christ went to this place to preach (announce) the good news of their salvation (the details) and then carry them up to heaven in the resurrection, but first a brief stop off on earth again.
This is a place of repose, on the father´s chest, where the child is safe. This was where John reposed on Jesus´chest.