Isaiah 58:13-14

You must observe the Sabbath rather than doing anything you please on my holy day. You must look forward to the Sabbath and treat the LORD’s holy day with respect. You must treat it with respect by refraining from your normal activities, and by refraining from your selfish pursuits and from making business deals. Then you will find joy in your relationship to the LORD, and I will give you great prosperity, and cause crops to grow on the land I gave to your ancestor Jacob.” Know for certain that the LORD has spoken.