Exodus 3:2-5 shows a principle regarding the making of something holy. Because God was present, the ground itself was holy and could not be approached in the ordinary fashion. God commanded Moses to treat it with a respect, a deference, that he would not give to something common. Interestingly, even though Moses knew there was something unusual about what he was observing, God had to tell him that he was on holy ground. Its holiness was something spiritual; it was not physically discernable.
The same presence of God makes the Sabbath holy, a cut above, transcendent, as compared to the other days not declared holy by God. God puts His presence into the Sabbath day for the sake of His people and His spiritual creation. The other six days are common and given to the pursuit of the mundane activities of life. Since God commands us to keep the Sabbath holy, we must strive to avoid those mundane things that make the Sabbath—or promote making it—into an ordinary day.
John W. Ritenbaugh
The Fourth Commandment (Part One) (1997)
Other Forerunner Commentary entries containing Exodus 3:2:
1 Kings 19:5-6
2 Corinthians 11:2