I think we would both agree that the early disciples were not keeping a biblical passover because they were not strictly following the code set forth in the old covenant.
I'm sure that some of these disciples were doing so for purely traditions sake, but the practices died out within a few generations.
But it also true that most of the groups that continued to push these old covenant practices, like the Ebionties, were heretical in much of their theology.
The fact remains that biblical passover ended when the temple was destroyed and the Levitical priesthood came to a close, and we see nothing in the NT to suggest that the Church expected to continue keeping it as a religious ceremony.
Yup....the Christian Passover was what took the place of the old rituals and this is what Luke and Paul had been observing in [Acts 20:6]. Our Saviour instructed us in the proper observance by saying: "Do this in remembrance of Me" [Luke 22:19].
I'm sure that some of these disciples were doing so for purely traditions sake, but the practices died out within a few generations.
The canons of the church well into the fourth century disagree with your statement. Canon XXIX CHRISTIANS must not judaize by resting on the Sabbath, but must work on that day, rather honouring the Lord's Day; and, if they can, resting then as Christians. But if any shall be found to be judaizers, let them be anathema from Christ. Canon XXXVII It is not lawful to receive portions sent from the feasts of Jews or heretics, nor to feast together with them. Canon XXXVIII IT is not lawful to receive unleavened bread from the Jews, nor to be partakers of their impiety.
These are Canons from the "Council of Laodicea" in 364 A.D.: here.
I guess the question would be......why are Christians celebrating the Days of Unleavened Bread and other Feast Days with the Jews more than three hundred years after the crucifixion? That's a long time to have not "gotten the word". Maybe these folks were off shoots of that radical sect of Polycrates who insisted on keeping Passover on the 14th as The Apostle John had instructed.....many years after the death and resurrection of Our Lord!
219 years ago they were framing the Constitution in Philadelphia. This gives you a sense of just how long three hundred years actually is.
But it also true that most of the groups that continued to push these old covenant practices, like the Ebionties, were heretical in much of their theology.
Why don't you show me from scripture where the Passover and other Feast Days were eliminated?
Christ became the Temple wherein any who would and/or will abide in Him every day do not need a physical building. Christ became the forever and for all time blood sacrifice. At the moment of His death on the cross there was the miracle within the temple where the 'veil' was rent from top to bottom.... No place for a flesh priest to hide behind to offer up sacrifices any more.