Thematic Bible: The last enemy that shall be destroyed

Now since the children have flesh and blood in common, He also shared in these, so that through His death He might destroy the one holding the power of death-that is, the Devil- and free those who were held in slavery all their lives by the fear of death.

For He must reign until He puts all His enemies under His feet. The last enemy to be abolished is death. For He has put everything under His feet. But when it says "everything" is put under Him, it is obvious that He who puts everything under Him is the exception. read more.
And when everything is subject to Him, then the Son Himself will also be subject to Him who subjected everything to Him, so that God may be all in all.