1 Corinthians 15:27-29

27 for “He put everything in subjection under his feet.” [1] But when it says that “everything” has been subjected, obviously the word does not include God, who is himself the one subjecting everything to the Messiah.

28 Now when everything has been subjected to the Son, then he will subject himself to God, who subjected everything to him; so that God may be everything in everyone.

29 Were it otherwise, what would the people accomplish who are immersed on behalf of the dead? If the dead are not actually raised, why are people immersed for them?