15 For six days work is to be done, but the seventh day is a day of sabbath rest, holy to the LORD. Whoever does any work on the Sabbath day is to be put to death.

Read Exodus 31:15 Using Other Translations

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.
Six days shall work be done, but the seventh day is a Sabbath of solemn rest, holy to the LORD. Whoever does any work on the Sabbath day shall be put to death.
You have six days each week for your ordinary work, but the seventh day must be a Sabbath day of complete rest, a holy day dedicated to the LORD . Anyone who works on the Sabbath must be put to death.