It is good to rest on the Sabbath-day from the works of our calling; but if we rest from labour and do no more, the ox and the ass keep the Sabbath as well as we; for they rest from labour. We must dedicate the day to God; we must not only 'keep a Sabbath,' but 'sanctify' a Sabbath.Ten Commandments, 100
Sabbath rest is not the post-eschaton Sabbath celebrated in heaven, nor the rest that believers experience in death, but a present rest enjoyed by those who believe (4:3), anticipating a greater future "rest" (4:11). Human Sabbath keeping is a metaphor for cessation from works (4:10) in commemoration of God's rest at creation (4:4=Gen. 2:2) and of salvation provided by Christ. The physical Sabbath rest that God's people enjoy reflects the inner spiritual rest, which is a deposit of the final eschatological rest proleptically experienced "today" (4:7)For the Glory of God (280)
the Sabbath-day is lost, polluted, and desecrated when our eyes are distracted from the Sabbath (Ezek 22:26) and we do things on that day which we are forbidden, and we omit what we ought to do (Matt 12:2[,11,12]).Synopsis of a Purer Theology, Disputation 21
The wording for this commandment is unique. For one is not given a simple command, "Hallow the Sabbath" (as in the others), but the following warning precedes it: "Remember the Sabbath-day, that you keep it holy." This shows that the matter is of a sort that can fade easily into oblivion (because it is not engraved into our nature); therefore, we must cultivate it constantly in our memories, and we should not make light of it but guard it very carefully.Synopsis of a Purer Theology, Disputation 21
One day in seven should be especially devoted to corporate worship and other spiritual exercises that restore the soul's rest in God and zeal for His name. It should provide physical refreshment and fit one for a week of devoted service to Christ.https://www.desiringgod.org/articles/a-baptist-catechism
the fourth commandment is a moral law which still applies to believers today. Its careful observance is no more legalism than is obedience to the other nine.The Christian Sabbath, 5
his grandfather's generation referred to Sunday as the 'holy Sabbath,' his father's to the 'Sabbath,' and his to 'Sunday.' Today we think of it as the back half of the 'weekend.' This may be the commandment most visibly ignored and overtly violated by professed Bible-believing Christians today.The Christian Sabbath, 5
It is sacrilege to rob for civil work the time which God has set apart for his worship. He that devotes any time of the Sabbath to worldly business, is a worse thief than he who robs on the highway; for the one does but rob man, but the other robs God.Ten Commandments, 99