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http://members.aol.com/twarren13/sabbath.html

"Q. 9. How doth it appear that the first day of the week is appointed by God to be the weekly Sabbath?
A. 1. There is a like reason for the appointment of the first day as there was for the seventh. The reason of God's appointing the seventh was, his resting from his works of creation; and there is a like reason for appointing the first day, which was the day of Christ's resurrection, namely, the Son of God's resting from his suffering works about man's redemption, into which rest he is said to enter, and which we are more nearly concerned to remember. "For he that is entered into his rest, hath ceased from his own works, as God did from his."— Heb. 4:10. 2. The Lord Jesus hath put his name upon the first day of the week "I was in the Spirit on the Lord's-day."— Rev. 1:10. There is reason to believe that the Lord's-day here spoken of was the first day of the week, because it is a certain determinate day, and it is spoken of as a day which was well known among Christians by that name; and the first day of the week being the day of the Lord's resurrection, and wherein Christians did use to assemble themselves together upon, had the only reason for such denomination. There is also reason to believe that the Lord did put his own name upon this day, because none had authority to put his name upon any day but himself; and the apostle calling it the Lord's-day, by the inspiration of the Spirit no doubt but it was the Lord's will it should be so called, and by consequence it was his will that this day should be used and observed as an holy day unto himself. As the second sacrament is called the Lord's Supper, because it was appointed by the Lord; so the first day of the week is called the Lord's day, because it was appointed by the Lord; and this day being appointed, no other is to be observed now as the Christian Sabbath. 3. The appointment of the first day of the week to be the Sabbath may be inferred from 1 Cor. 16:1, 2: "Now, concerning the collection for the saints, as I have given order to the Churches of Galatia, even so do ye. Upon the first day of the week, let every one of you lay by him in store, as God hath prospered him." The apostle having given order from the Lord to the Churches of Galatia and Corinth, and by consequence to the other Churches of the Gentiles, for collections on the first day of the week, as God had prospered them on other days, we may infer, this being a Sabbath-day's work, that he had also, from the Lord, given order for the observation of this first day, as the weekly Sabbath. 4. We read of the disciples being assembled together on the first day of the week, and that Jesus then came among them (John 20:19); and that eight days afte; they met again, which was another first day, and Jesus came to them.— Verse 26. Moreover, that it was the practice of Christ's disciples to meet together to worship the Lord, to hear the word, and break bread, or receive the sacrament of the Lord's supper, on the first day of the week. "And upon the first day of the week, when the disciples were come together to break bread, Paul preached unto them," &c.— Acts 20:7. Paul had been with them Seven days (verse 6), and yet we read of no solemn meeting but on the first day of the week, the last of the seven wherein he abode with them. It was not on the old Sabbath, the last day of the week, that the solemn assembly for worship was held, but on the first day; which, had it not been the Sabbath of new appointment, and of necessary observation to Christians, would have been most inconvenient for Paul to have spent in religious exercises until midnight, when the next morning he was to take his jour ney. All which being considered, together with the practice of Christians from the apostles' days, it may be evident unto them that desire not to cavil, that the first day of the week is appointed by the Lord to be the Christian Sabbath."

http://www.bpc.org/resources/vincent/wsc_vi_059.html