The seven days of Unleavened Bread remained an important period for all the early Christian assemblies.
It was by means of these seven days that they determined when to observe Passover.
For the Quartodeciman practice (System A), being the original view of the early Christian assemblies, and its quasi-Quartodeciman offshoot System D (the early western view), these seven days began with the 14th and extended until the end of the 20th day of the first lunar month.
We begin to uncover this important detail by demonstrating three facts:
• The Quartodecimans observed the 14th of Abib as a high Sabbath (great festival day) and as the first of the seven days of Unleavened Bread.
• The quasi-Quartodecimans kept the same seven days of Unleavened Bread as observed by the early Quartodecimans.
• Both the early Quartodecimans of System A and the quasi-Quartodecimans of System D deferred to the apostle John as their ultimate authority for establishing which days were to be observed for the seven days of Unleavened Bread.
