A nice discussion found here: http://www.sermonaudio.com/sermoninfo.asp?m=t&s=98171531161

LVIII. Ques. What is required in the fourth commandment? Ans. The fourth commandment requireth the keeping holy to God such set times as he hath appointed in his Word, expressly one whole day in seven, to be a holy Sabbath to himself. Q. 1. What is the difference between the worship required in this fourth […]