Source : Webster's Revised Unabridged Dictionary (1913)

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

         Whosoever will, let him take . . . freely. --Rev. xxii.
                                                  17.