The Didache (sometimes referred to as “The Teaching of the Twelve Apostles”) was written by early Christians around the late first century or early second century. It is a short read, but a great follow-up to the Book of Acts, if you want to get a glimpse of how the early Church practiced the Faith.
I have a Didache Bible that is such an amazing tool. It correlates teachings of the catechism with Bible verses as they go. So awesome to see the two in tandem like that.
I heard about this Bible from an inmate at the prison near me during my time in the prison ministry. He was very well versed in Catholicism and Bible verses. I had asked him about the names of the other 4 Archangels not mention in the any of my Bible’s and he told me which Bible to look for the refernce, and it was in the “Ignatius Catholic Study Bible New Testament” in revelations 8:2 (under the foot notes are named: Uriel, Raphael, Raguel, Michael, Saraqael, Gabriel, and Ramiel) also ref. 1 Enoch 20, 1-8; 81,5. They are known as the angels of the Lord’s presence (Testament of Levi 3, 7: cf Lk 1:19
The Didache was not discovered until 1873. I think the fact that it is not considered Canonical has more to do with the timing of it’s discovery than a discrepancy of when this particular sect fasted. I’m not saying that it should be Canonical, as this is not up to me to determine. As you read the Didache, some of it should sound familiar as it references the Gospels (I believe Matthew or Mark in particular).