Now, what you premise seems to be a mere assumption, for which there is not a shadow of proof, either in the text or context. No one of the Evangelists says that they met for worship; nor did they worship, so far as we know, when met together. In regard to the first of those occasions, we are told, that they "were assembled for fear of the Jews;" and, as to the second, we are simply informed, that they "were within," which means, probably, that they were at home; for Luke tells us, that, on the day of the ascension, the eleven "abode" in an upper room. Acts 1:13.
Again, your inference is not necessary; for the matter may be explained thus: On the day of the resurrection, the eleven, having procured a common lodging-room, "assembled for fear of the Jews;" and Christ appeared to them before the close of the same day, in order that they, who were to be witnesses of his resurrection, might have ocular demonstration of the fact, that he rose "according to the scriptures." On the other occasion, "after eight days," he met them, probably, "as they sat at meat," (Mark 16:14,) because Thomas, who had not seen him since his resurrection, was then with them.
These reasons are surely sufficient to account for his appearing on those occasions. But why demand reasons at all? Had he not a right to meet his disciples on any day of the week that he chose, without telling us why? Can you tell us why he appeared to the brethren when they were fishing? Christ has done many things for which the only reason we can give is, that it seemed good to him.
YOUR FOURTH PROOF.
Acts 2:1—"And when the day of Pentecost was fully come, they were all with one accord in one place."
Your premises are—1. That the Feast of Pentecost fell that year on the first day of the week. 2. That the disciples were, for that reason, with one accord in one place. Whence you infer, that the first day of the week is the Sabbath. I reply—
Whether the Feast of Pentecost fell that year on the first day of the week, or not, the disciples did not meet to keep the Sabbath, but to celebrate Pentecost. They would have been, in like manner "with one accord in one place," if it had been the fourth day of the week, because it was the day of Pentecost. Therefore, your inference is not only unnecessary, but wholly inadmissible.
YOUR FIFTH PROOF.
Acts 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."
You premise, that the disciples came together, in this instance, to celebrate the Lord's Supper, and to hear the word. Whence you infer, that the first day of the week is the Sabbath.