Responsa
The Rashba was considered an outstanding rabbinic authority, and more than 3,000 of his responsa are known to be extant. Questions were addressed to him from Spain, Portugal, Italy, France, Germany, and even from Asia Minor. His responsa, which cover the entire gamut of Jewish life, are concise and widely quoted by halakhic authorities.
The Rashba's responsa also illustrate his opposition to messianism and prophetic pretensions as a general phenomenon, with examples against Nissim ben Abraham and Abraham Abulafia.
Read more about this topic: Shlomo Ben Aderet