Where does arc-angel Michael appear in the bible?

Answer 1

The first mention of St. Michael the Archangel - by name at least - is found in the book of Daniel. He appears in chapter 10, but the relevant prophecy is in chapter 12:

"At that time Michael, the great prince who protects your people, will arise. There will be a time of distress such as has not happened from the beginning of nations until then. But at that time your people-everyone whose name is found written in the book-will be delivered. Multitudes who sleep in the dust of the earth will awake: some to everlasting life, others to shame and everlasting contempt. Those who are wise will shine like the brightness of the heavens, and those who lead many to righteousness, like the stars for ever and ever." - Daniel 12:1-3.

It is also mentioned in Revelation 12:7: "And there was a great battle in heaven, Michael and his angels fought with the dragon."