Sefer Michah (Micah) is the book of the prophecies of Michah of Moreshet (a town in Yehudah), a navi (prophet) in the days of Yotam, Achaz and Chizkiyahu (Hezekiah), kings of Yehudah (Judah). He prophesies about Shomron (Samaria), the capital of the northern kingdom of Yisrael, and about Yerushalayim (Jerusalem) (1:1). It is one of the Trei Asar (the Twelve), the twelve short books of the Neviim Acharonim (the Later Prophets), which the Gemara (Bava Batra 14b) says are written together as one sefer.
Hashem comes down to judge Shomron for its idols, and the blow reaches the gate of Yerushalayim (1). Michah rebukes the powerful who seize fields and houses, the leaders who crush the people, and the judges, kohanim (priests) and neviim who work for pay. He foretells that Tziyon (Zion) will be plowed like a field (2–3). Then comes the vision of the end of days, when the nations go up to the mountain of Hashem and no longer learn war (4). A ruler of Yisrael will come out of Beit Lechem (Bethlehem), and the she'erit (remnant) of Yaakov will be like dew among the nations (5).
Hashem brings His case against His people and reminds them of the exodus from Mitzrayim (Egypt) and of Balak and Bilam. He wants them to do justice, love chesed (kindness) and walk humbly with Him (the Gemara, Makkot 24a, says that Michah summed up the mitzvot in these three) (6). Michah mourns a land where no one can be trusted and waits for Hashem. The sefer closes with praise of Hashem, who forgives sin and casts it into the depths of the sea (7). These closing pesukim are said at Tashlich.
Sefer Michah has seven perakim, and two haftarot come from it. Michah 5:6–6:8 is the haftarah of Parshat Balak, and 7:18–20 is read after Sefer Yonah at Mincha of Yom Kippur.