Recently, blogger Xulon, from Theologica posted this excellent series focusing on ethics, Law, and the question of the Sabbath. This is post 4 of 4.
Therefore do not let anyone judge you with respect to food or drink, or in the matter of a feast, new moon, or Sabbath days —these are only the shadow of the things to come, but the reality is Christ! (Colossians 2:16-17)
These verses contain one of two uses of the word Sabbath in the New Testament Epistles. The other is Hebrews 4:9 which says there is a Sabbath rest for the people of God (Besides this, the word is used 9 times in Acts and 49 times in the Gospels). Combined, these two verses teach us that the Sabbath Rest provided for the believer is the Gospel of Christ (or, if you wish, Christ himself). But they also teach that the keeping of the Sabbath was a shadow, now fulfilled.