Shalom Dov Baer Schneersohn (1860–1920) wrote 8 books including Lessons in kuntres heichaltzu, Be-shaʻah she-hiḳdimu, 672, and [Maʼamar U-miḳneh rav 666] =. Their work covers Hasidism, Judaism, and Sermons. It draws from the Jewish Mysticism and Judaism traditions.