The Mishnah Berurah (Hebrew: משנה ברורה "Clear Teaching") is a work of halakha (Jewish law) by Rabbi Yisrael Meir Kagan (Poland, 1838–1933, also known as Chofetz Chaim). It is a commentary on Orach Chayim, the first section of the Shulchan Aruch which deals with laws of prayer, synagogue, Shabbat and holidays, summarizing the opinions of the Acharonim (post-Medieval rabbinic authorities) on that work. The title comes from Talmud Bavli Masechet Shabbat 138b-139a, "They will rove, seeking the word of the LORD, but they will not find it (Amos 8:12) -- they will not find clear teaching and clear law in one place." Source: Wikipedia (en)