The Collaborative International Dictionary of English v.0.48:

Benefit \Ben"e*fit\, v. t. [imp. & p. p. Benefited; p. pr. &
   vb. n. Benefitting.]
   To be beneficial to; to do good to; to advantage; to advance
   in health or prosperity; to be useful to; to profit.
   [1913 Webster]

         I will repent of the good, wherewith I said I would
         benefit them.                            --Jer. xviii.
                                                  10.
   [1913 Webster]