Exodus 20:8-11:
Remember the Sabbath day, to keep it holy. Six days you shall labour and do all your work, but the seventh day is the Shabbath of the LORD your God. In it you shall do no work: you, nor your son, nor your daughter, nor your male servant, nor your female servant, nor your cattle, nor your stranger who is within your gates. For in six days the LORD made the heaven and the earth, the sea, and all that is in them, and rested the seventh day. Therefore the LORD blessed the Sabbath day and hallowed it.

Jesaja 58,13-14:
If you turn away your foot from the Sabbath, from doing your pleasure on My holy day, and call the Sabbath a »delight«, the holy day of the LORD, honourable; and shall »honour« him, not doing your own ways, nor finding your own pleasure, nor speaking your own words. Then you shall delight yourself in the LORD; and I will cause you to ride on the high hills of the earth, and feed you with the heritage of Jacob your father. For the mouth of the LORD has spoken.

Translation: New King James Version if not marked different.