This ephemeral appearance of Karaism on Spanish soil was fruitful for Jewish historical literature, for it induced the philosophically trained Abraham ibn Daud of Toledo to write his "Sefer ha-Ḳabbalah" (1161), which is invaluable for the history of the Jews in Spain.
a Jewish religious movement that repudiated oral tradition as a source of divine law and defended the Hebrew Bible as the sole authentic font of religious doctrine and practice.