john said:
This may seem like a very obvious questions that every Christian should know the answer to, but what all is involved in "observing the Lord's day".
On Sunday we cease from our labor only so that we might, by our ceasing, enter into the joy of the completed work our God had done. Its important that we declare what Sabbath is, rather than define it only by saying what it is not. Along with the many good links Pilgrim has provided I found the one below a good study on this topic too.
Worship and the Sabbath Day: The Sabbath Day by Bob Burridge
The Westminster Confession of Faith, Chapter XXI
Of Religious Worship, and the Sabbath Day
VIII. This Sabbath is then kept holy unto the Lord, when men, after a due preparing of their hearts, and ordering of their common affairs beforehand, do not only observe an holy rest, all the day, from their own works, words, and thoughts about their worldly employments and recreations,[38] but also are taken up, the whole time, in the public and private exercises of his worship, and in the duties of necessity and mercy.[39]
38. Exod. 16:23, 25-26, 29-30; 20:8; 31:15-17; Isa. 58:13-14; Neh. 13:15-22
39. Isa. 58:13-14; Luke 4:16; Matt. 12:1-13; Mark 3:1-5
Wes