The Sabbath is a commandment for all of God's people

"So let no one judge you in food or in drink, or regarding a festival (heortes) or a new moon or sabbaths, which are a shadow of things to come, but the substance is of Christ." (Colossians 2:16-17 New King James Version) "Therefore do not let anyone judge you by what you eat or drink, or with regard to a religious festival (heortes), a New Moon celebration or a Sabbath day. These are a shadow of the things that were to come; the reality, however, is found in Christ." (Colossians 2:16-17 New International Version) "Let no man therefore judge you in meat, or in drink, or in respect of a holy day (heortes), or of the new moon, or of the Sabbath days; which are a shadow of things to come; but the body is of Christ." (Colossians 2:16-17 King James Version) The Greek word translated "holy day" at Colossians 2:15 in the King James Version is "heortes," which means "festival, feast" or "feast day." (W.E. Vine"s Complete Expository Dictionary of Old and New Testament Words) This is the word used in the Bible for annual feasts such as the Passover (Luke 2:41; 22:1) and the feast of tabernacles (John 7:2). All annual Sabbaths were part and parcel of the annual feasts, and could not exist apart from them. For example, the feast (heortes) of unleavened bread included the Sabbaths which fell on the first and seventh days of this weeklong festival. (Leviticus 23:6-8) Heortes is the Greek term in the Greek Septuagint of the Old Testament as well as in the New Testament embracing all such annual Sabbaths. The "feasts [heortes] of the Lord" (Leviticus 23:4) include the Passover (Leviticus 23:5), the feast of unleavened bread (Leviticus 23:6-8), Pentecost (Leviticus 23:15-16, 21), the memorial of trumpets (Leviticus 23:24-25), the Day of Atonement (Leviticus 23:27-32), the feast of tabernacles (Leviticus 23:34-44), and so on. Thus, when Paul mentioned the annual "holydays" or "festivals" (heortes), and the monthly "new moons" at Colossians 2:16, he already included all yearly and monthly Sabbaths. There was nothing left for Paul to mean by "the Sabbath days" except the weekly Sabbath, because all the other Sabbaths were already mentioned as heortes (yearly sabbaths) and new moons (monthly Sabbaths). The implication is that the Sabbath being described in Colossians 2:16 is the weekly Sabbath. When Paul here says "Sabbath days," if he meant annual Sabbaths he was needlessly repeating himself. In that case he would be saying, "Let no one judge you regarding"an annual Sabbath, a new moon, or an annual Sabbath," a statement neither logical nor likely! It is far more likely that Paul was saying, "Let no one judge you regarding"an annual Sabbath, a new moon, or a weekly sabbath." At Colossians 2:16 the expression "the Sabbath days" has the word "days" in italics because it was not there in the original Greek, but was added or supplied by the translator. Without the added word, the original King James reading would be, "Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of THE Sabbath." This reading removes any doubt that Paul meant the seventh day, and is supported by the fact the very same word Paul used for the Sabbath at Colossians 2:16 is translated "THE Sabbath" at Matthew 28:1; John 5:9, 10, 16 and other places. The expression "Sabbath days" at Colossians 2:16 is used 8 other times in the King James Version an in all eight it means the weekly Sabbath. (Matthew 12:5, 10, 12; Mark 3:4; Luke 4:31; 6:2, 9; Acts 17:2) In fact, the term "Sabbath days" is never used for any other day except the seventh day! In every case, not almost every case, but every case without exception, "Sabbath says" means the weekly Sabbath. Now having established that Paul was including the weekly sabbath in his list of shadows that pointed to Christ, just as he fulfilled the annual festivals such as the Passover and Christians no longer have to observe it, and he fulfilled the new moons so we no longer keep them, so too he fulfilled the sabbath so we no longer have to keep it. For the last 2000 years the church has not observed these days for this very reason. Paul says "Let no one judge you" regarding these days. If these days were binding ordinances on us today, we Christians could rightly be judged for how we observe them, or for not observing them, for it its the duty of elders in the church to judge matters of wrongdoing in the church and correct the brothers when they err. (1Corinthians 5:11-13) Hebrews 8:13 heralds the end of the old covenant, and we know that covenant was the Ten Commandments written on stone tablets, kept in the ark, according to 1 Kings 8:9, 21. Exodus 34:27, 28 is very explicit that the words of the covenant are the Ten Commandments, and Deuteronomy 4:13 calls the the covenant the Ten Commandments. So we have good evidence that the covenant in Hebrews 8 which God made with Israel was the Ten Commandments, and the seventh day sabbath was one of those commandments; therefore, the end of that covenant means the end of the sabbath. Unless my opponent can show me where the sabbath is instituted under the New Covenant for Christians, then he has lost this debate. He cannot use its inclusion in an abolished covenant as reason to bind it on our shoulders. I look forward to his opening arguments.