An important fact regarding the Quartodecimans that has been missed by most followers of Yahweh is that the Quartodecimans claimed and demonstrated authority from Yahushua the messiah and Scriptures for their practice of Passover.
Though they considered themselves not to be under the written Torah of Moses, they followed the guides of the Torah of Moses with regard to “all the festivals.”
Chrysostom (347-407 C.E.)
Chrysostom, a strong advocate of the Roman Catholic System E, for example, demonstrates this point in his work titled Adversus Judaeos, where he condemns the Quartodeciman Christians because of their practice of celebrating such scriptural High Sabbath days as the Day of Trumpets, the Day of Atonement, and the Festival of Tabernacles.1