Who are baptized for the dead — Perhaps baptized in hope of blessings to be received after they are numbered with the dead. Or, "baptized in the room of the dead" — Of them that are just fallen in the cause of Christ: like soldiers who advance in the room of their companions that fell just before their face.
Related Commentaries of 1 Corinthians 15:29
1 Corinthians 15:29
29 Else what shall they do which are baptized for the dead, if the dead rise not at all? why are they then baptized for the dead?