The Ten Commandments say the 7th day is the Sabbath and sets forth commands for its observance I have proven that the Catholic Church says that THEY changed it to the "Lord's day" . The first day of the week is NEVER called the Lord's day in the Bible. The only day of the week referred to as the Lord's day is the 7th day Sabbath. Here are the only few verses in the Bible that even mention the 1st day of the week. As you can see God never changed the Sabbath observance to the 1st day of the week. Violation of the Sabbath is a violation of the moral law. It is right up their with lying, stealing and murder. It is important to God.
Mat 28:1
In the end of the sabbath, as it began to dawn toward the first
day of the week, came Mary Magdalene and the other Mary to see the sepulchre.
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Mar 16:2
And very early in the morning the first
day of the week, they came unto the sepulchre at the rising of the sun.
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Mar 16:9
Now when
Jesus was risen early the first
day of the week, he appeared first to Mary Magdalene, out of whom he had cast seven devils.
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Luk 24:1
Now upon the first
day of the week, very early in the morning, they came unto the sepulchre, bringing the spices which they had prepared, and certain
others with them.
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Jhn 20:1
The first
day of the week cometh Mary Magdalene early, when it was yet dark, unto the sepulchre, and seeth the stone taken away from the sepulchre.
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Jhn 20:19
Then the same day at evening, being the first
day of the week, when the doors were shut where the disciples were assembled for fear of the Jews, came Jesus and stood in the midst, and saith unto them, Peace
be unto you.
Act 20:7
And upon the first
day of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight.
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1Co 16:2
Upon the first
day of the week let every one of you lay by him in store, as
God hath prospered him, that there be no gatherings when I come.