Benefactive case is a case that expresses that the referent of the noun it marks receives the benefit of the situation expressed by the clause.
Gove, Philip B. (editor). 1966.Webster's third new international dictionary of the English language. Unabridged, with seven language dictionary. Chicago: Encyclopaedia Britannica.
Crystal, David. 1980.A first dictionary of linguistics and phonetics. Boulder, CO: Westview.