A common question in Sabbatarian circles is whether or not believers should go out to eat on Sunday. The line of reasoning is that even though the believer may be observing the Sabbath, he or she is not letting the people who are serving him or her observe the Sabbath. Meredith Kline has an interesting paragraph on the subject in Kingdom Prologue, p. 81.
Whether the Sabbath is viewed as God’s promise of the consummation of the covenant order or as man’s pledge of devotion to the covenant suzerain, it is always a sign of the covenant. In this primal sign the covenant receives comprehensive expression, for the Sabbath brings out the nature of the covenant as both personal relationship and historical kingdom program. For Israel the Sabbath was the sign of the covenant par excellence (Exodus 31:16, 17). That the Sabbath was appointed to the covenant community at the creation suggests that it is of perpetual validity, as long at least as that community experiences life and history as a succession of days. However, if we appreciate this essential connection of the Sabbath with the covenant, and especially if we recognized that the Sabbath is always covenantal promise and privilege as well as duty, we will avoid thinking of it abstractly as at any time after the Fall a universal ordinance of general application to the world at large. The Sabbath belongs to the covenant community exclusively.
According to Kline, it seems that so long as the people serving you are not in the covenant, there should not be a concern. Presumably, if they were in the covenant, they would not be working on the Lord’s Day. However, it still may not be prudent to [even indirectly] encourage people in their anti-covenantal activities. This is a very sticky situation, for one could suggest a multitude of examples where we may be encouraging people in this direction.
Please feel free to add to this discussion with comments.