Daniel 10:13." But the prince of the kingdom of Persia withstood me one and twenty days, but lo, Michael, one of the chief princes came to help me and I remained there with the kings of Persia." This was Michael interceding so that prayer could be answered. Also, Daniel was fasting for three full weeks. This was the vision for the latter days. Just food for thought here, something more about 21 days.
Why 21?
777 God wins.
Daniel 10:13." But the prince of the kingdom of Persia withstood me one and twenty days, but lo, Michael, one of the chief princes came to help me and I remained there with the kings of Persia." This was Michael interceding so that prayer could be answered. Also, Daniel was fasting for three full weeks. This was the vision for the latter days. Just food for thought here, something more about 21 days.
Whatever the number, someone can find a link.
https://youtu.be/wvRu8-RN07s
This want you were asking?
No clue, but he says it's from the "let us worship" movement, so that's where I'd look.