The Collaborative International Dictionary of English v.0.48:

Whosoever \Who`so*ev"er\ (h[=oo]`s[-o]*[e^]v"[~e]r), pron.
   Whatsoever person; any person whatever that; whoever.
   [1913 Webster]

         Whosoever will, let him take . . . freely. --Rev. xxii.
                                                  17.
   [1913 Webster]