The Three Legacies of Alcoholics Anonymous are Recovery, Unity, and Service. These legacies have been passed down to us from the cofounders and old timers of A.A.

Recovery is contained in the Big Book and Twelve Steps.
Unity is contained in the Twelve Traditions.
Service is contained in every act which helps A.A. function or which carries the A.A. message to those who need it. Service is based on the Twelve Concepts