Exodus 23:12-13

“Six days [each week] you shall do your work, but on the seventh day you shall stop [working] so that your ox and your donkey may settle down and rest, and the son of your female servant, as well as your stranger, may be refreshed. Now concerning everything which I have said to you, be on your guard; do not mention the name of other gods [either in a blessing or in a curse]; do not let such speech be heard [coming] from your mouth.