22.7 As it is a law of nature, applicable to all, that a proportion of time, determined by God, should be allocated for the worship of God, so, by His Word, He has particularly appointed one day in seven to be kept as a holy Sabbath to Himself. The commandment to this effect is positive, moral, and of perpetual application. It is binding upon all men in all ages. From the beginning of the world to the resurrection of Christ the Sabbath was the last day of the week, but when Christ's resurrection took place it was changed to the first day of the week, which is called the Lord's day. It is to be continued to the world's end as the Christian Sabbath, the observance of the seventh day being abolished. Exod. 20:8; Acts 20:7; 1 Cor. 16:1,2; Rev. 1:10.
22.8 Men keep the Sabbath holy to the Lord when, having duly prepared their hearts and settled their mundane affairs beforehand, for the sake of the Lord's command they set aside all works, words and thoughts that pertain to their worldly employment and recreations, and devote the whole of the Lord's day to the public and private exercises of God's worship, and to duties of necessity and mercy. Neh. 13:15-22; Isa. 58:13; Mat. 12:1-13.
If you have questions about the Lord's Day and the Sabbath Day, I would encourage you to listen to our recent four-part sermon series on the fourth commandment, "The Command to Enter into the Lord's Rest."