Later most of the Shia, including Twelver and Ismaili, became Imamis. Imami Shia believe that Imams are the spiritual and political successors to Muhammad. Imams are human individuals who not only rule over the community with justice, but also are able to keep and interpret the divine law and its esoteric meaning. The words and deeds of Muhammad and the imams are a guide and model for the community to follow; as a result, they must be free from error and sin, and must be chosen by divine decree, or "nass", through Muhammad.