Originally Posted by
1hole
I wondered if it would be something like that (but you've omitted the other law He told you was wrong ....)
Now, given your background and training I'm not surprised you're confused. What you've been told by a RCC rule following, legalistic bunch of priests is that the Old Testament rules - sabbath worship - still applies to Christians; that's not true, certainly not for the reasons the Mosaic Law was given.
All of the Ten ARE important, in principle. But ALL ten of the Laws of Moses were fulfilled when the Lord died and rose again - every jot and tittle of the Law, as such, was completed at that moment.
However, all of the Ten - save that one - are repeated in one way or another in the New Testament so they still matter. We do need a day for worship but Christians are given full latitude in which day they come together. (see Mk 2:27, Rom 14:5-6)
Why? Well, first you need to understand that neither Hebrews nor Christians made that calendar. In fact, we have no reason to suspect a calendar as we know it even existed for Hebrews for several thousands of years after creation so keeping track of "weeks" and "days" didn't matter to anyone until Moses' stone tablets made it important.
To the degree a calendar existed even in the 400 years between Malachi and Matthew it was Roman. About 400 AD, one of your infallible Popes (Gregorie) accepted the Roman calendar but set the supposed date of Jesus birth around 400 AD. We still count BC/AD years from that point and we still use the Roman calendar with its pagan names for months and days. But there's no foundation to think the Roman calendar figured into God's concerns. (Col 2:12)
In apostolic times Christians came together to worship, study scripture and sing praises to God on Resurrection day, the first day of the week, on what the Romans called Sunday. And we have come to call Sunday the "Christian sabbath", which is fine until legalistic dummies start screaming about it. (Acts 20:4)
Next .... ?