7 And there was war in heaven. Michael and his angels fought against the dragon, and the dragon and his angels fought back. (Revelation 12:7)
in the Hebrew Bible Michael is mentioned by name in the Persian context of the post-Exilic Book of Daniel. There in Daniel does Michael appear—as "one of the chief princes" (Daniel 10:13) who in Daniel's vision comes to the angel Gabriel's aid in his contest with the angel of Persia, and is also described there as the advocate of Israel and "great prince who stands up for the children of your (Daniel's) people" (Daniel 10:21, 12:1). The Talmud tradition rendered his name as meaning "who is like El (God)? (but literally "El's Likeness")" (compare the late prophet Micah), but according to Rabbi Simeon ben Lakish (AD 230–270), all the specific names for the angels were brought back by the Jews from Babylon, and many modern commentators would agree.
Michael is one of the principal angels in Abrahamic tradition; his name was said to have been the war-cry of the angels in the battle fought in heaven against Satan and his followers.