What is required in the fourth commandment?

The fourth commandment requires of all men the sanctifying or keeping holy to God such set times as he hath appointed in his word, expressly one whole day in seven; which was the seventh from the beginning of the world to the resurrection of Christ, and the first day of the week ever since, and so to continue to the end of the world; which is the Christian sabbath,[1] and in the New Testament called The Lord’s day.[2]

1. Deut. 5:12, 14

   Observe the Sabbath day, to keep it holy, as the Lord your God commanded you.

   …but the seventh day is a Sabbath to the Lord your God. On it you shall not do any work, you or your son or your daughter or your male servant or your female servant, or your ox or your donkey or any of your livestock, or the sojourner who is within your gates, that your male servant and your female servant may rest as well as you.

   Gen. 2:2-3

   And on the seventh day God finished his work that he had done, and he rested on the seventh day from all his work that he had done.  So God blessed the seventh day and made it holy, because on it God rested from all his work that he had done in creation.

   I Cor. 16:1-2

   Now concerning  the collection for the saints: as I directed the churches of Galatia, so you also are to do.  On the first day of every week, each of you is to put something aside and store it up, as he may prosper, so that there will be no collecting when I come.

   Acts 20:7

   On the first day of the week, when we were gathered together to break bread, Paul talked with them, intending to depart on the next day, and he prolonged his speech until midnight.

   Matt. 5:17-18

   Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. For truly, I say to you, until heaven and earth pass away, not an iota, not a dot, will pass from the Law until all is accomplished.

   Isa. 56:2, 4, 6-7

   Blessed is the man who does this,
   and the son of man who holds it fast,
   who keeps the Sabbath, not profaning it,
   and keeps his hand from doing any evil.

   For thus says the Lord:
   “To the eunuchs who keep my Sabbaths,
   who choose the things that please me
   and hold fast my covenant….”

   And the foreigners who join themselves to the Lord,
   to minister to him, to love the name of the Lord,
   and to be his servants,
   everyone who keeps the Sabbath and does not profane it,
   and holds fast my covenant—
   these I will bring to my holy mountain,
   and make them joyful in my house of prayer;
   their burnt offerings and their sacrifices
   will be accepted on my altar;
   for my house shall be called a house of prayer
   for all peoples.

2. Rev. 1:10

   I was in the Spirit on the Lord’s day, and I heard behind me a loud voice like a trumpet….

Westminster Larger Catechism, Question 116