Daniel 10:20-21

He then said, “Don’t you know why I have come to you? Now, I am about to go back and fight the principality with him. Once we have defeated him, the principality over Greece will come next.”I will unveil to you what is written in the Book of Truth: but first, I want you to know that there is none who fights alongside me against these forces of darkness except Michael, your people’s prince.