The Mishnah, compiled at the end of the 2nd century CE, describes a debate over the status of some books of "Ketuvim", and in particular over whether or not they render the hands ritually impure. "Yadaim" 3:5 calls attention to a debate over Song of Songs and Ecclesiastes. The "Megillat Ta'anit", in a discussion of days when fasting is prohibited but that are not noted in the Bible, mentions the holiday of Purim. Based on these, and a few similar references, Heinrich Graetz concluded in 1871 that there had been a Council of Jamnia (or Yavne in Hebrew) which had decided Jewish canon sometime in the late 1st century ("c." 70–90). This became the prevailing scholarly consensus for much of the 20th century.