Q: what did the writer of the New Testament mean by the words “Sabbath” and the Sabbath day?
Q: What did Matthew mean? 
---He certainly did not mean the first day of the week, but he meant the day before the first day of the week. Matthew 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. He meant what all other Jewish writers ever meant, viz: Exodus 20:10 The seventh day is the Sabbath of the Lord your God."
Elihu
