Exodus 31:15

For six days work may be done, but the seventh day is a Sabbath of complete rest, holy to the Lord. Whoever does any work on the Sabbath day must surely be put to death.
BSB · Berean Standard Bible
Six days may work be done; but in the seventh is the sabbath of rest, holy to the Lord: whosoever doeth any work in the sabbath day, he shall surely be put to death.

Note holy: Heb. holiness

KJV · King James Version
Six days shall work be done, but on the seventh day is a Sabbath of solemn rest, holy to the Lord. Whoever does any work on the Sabbath day shall surely be put to death.
WEB · World English Bible
Six days shall work be done, but on the seventh day is a sabbath of solemn rest, holy to Jehovah: whosoever doeth any work on the sabbath day, he shall surely be put to death.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

Six days
Exodus 31:17; Exodus 16:26; Exodus 20:9; Exodus 34:21; Leviticus 23:3; Ezekiel 46:1; Luke 13:14
the sabbath
Exodus 16:23; Exodus 20:10; Genesis 2:2; Leviticus 23:3, 32; Luke 23:56; Hebrews 4:9
holy
Heb. holiness. whosoever.
Numbers 15:32–36; Jeremiah 17:24–27