If thou turn away thy foot from the sabbath, from doing thy pleasure on my holy day; and call the sabbath a delight, the holy of the LORD, honourable; and shalt honour him, not doing thine own ways, nor finding thine own pleasure, nor speaking thine own words:
Then shalt thou delight thyself in the LORD; and I will cause thee to ride upon the high places of the earth, and feed thee with the heritage of Jacob thy father: for the mouth of the LORD hath spoken it. – Isaiah 58:13,14
This is the fourth commandment:
Remember the sabbath day, to keep it holy.
Six days shalt thou labour, and do all thy work:
But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:
For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it. – Exodus 20:8-11
In the Westminster Shorter Catechism, Question 60 asks, How is the sabbath to be sanctified?
The answer given is:
The sabbath is to be sanctified by a holy resting all that day, even from such worldly employments and recreations as are lawful on other days; and spending the whole time in the publick and private exercises of God’s worship, except so much as is to be taken up in the works of necessity and mercy.
Question 61 asks, What is forbidden in the fourth commandment?
The fourth commandment forbiddeth the omission or careless performance of the duties required, and the profaning the day by idleness, or doing that which is in itself sinful, or by unnecessary thoughts, words, or works, about our worldly employments or recreations.
Scripture references are given in the Shorter Catechism substantiating the answers given. An online version of the Westminster Shorter Catechism is available to those who would like to quickly and easily access these references.