Adam Clarke on Exodus 20:9

Six days shalt thou labor - Therefore he who idles away time on any of the six days, is as guilty before God as he who works on the Sabbath. No work should be done on the Sabbath that can be done on the preceding days, or can be deferred to the succeeding ones. Works of absolute necessity and mercy are alone excepted. He who works by his servants or cattle is equally guilty as if he worked himself. Hiring out horses, etc., for pleasure or business, going on journeys, paying worldly visits, or taking jaunts on the Lord's day, are breaches of this law. The whole of it should be devoted to the rest of the body and the improvement of the mind. God says he has hallowed it - he has made it sacred and set it apart for the above purposes. It is therefore the most proper day for public religious worship.