DAN 10:13

13 Forsooth the prince of the realm of Persians against-stood me one and twenty days, and lo! Michael, one of the first princes, came into mine help, and I dwelled still there beside the king of Persians. (And the angel prince of the kingdom of Persia stood against me for twenty-one days, and behold! Michael, one of the chief angels or one of the chief princes, came to my help, because I still lived there with the prince of Persia.)