The modern practice of "sabbath-keeping" is erroneous. The sabbathians who attacked the Rev. Klueg are indirectly quoting the father of lies saying, "Yeah, hath God said?"
The Scriptures show that the requirement to keep the sabbath has been terminated. New Testament data lead to the conclusion that the law of Moses (with all of its components - including the sabbath) has been abrogated.
Paul affirmed that the "law of commandments" was abolished "through the cross" (Eph. 2:14ff). Similarly, the "bond written in ordinances" (which contained the feast days, sabbaths, etc.) was taken out of the way, having been nailed to the cross (Col. 2:14-16).
Sabbatarians allege, however, that only the ceremonial features (e.g., animal sacrifices) of the Mosaic covenant were abolished at the cross. The moral elements of the law (e.g., the Ten Commandments), it is argued, continue to this very day.
This position is arbitrary, artificial, and will not stand the test of scripture:
God promised to make a "new covenant," which would not be like the one given to Israel when the nation left Egypt (Jer. 31:31ff). When that "new covenant" was given, a "change" in laws was made (Heb. 7:12). But the old law, bestowed when Israel came out of Egyptian bondage, contained the Ten Commandments (1 Kgs. 8:9,21). Thus, the decalogue passed away when the Old Testament was replaced by the New.
In Romans 7, the apostle argued that the Christian is "dead to the law through the body of Christ." He further contended that the child of God is "discharged from the law."
Well, exactly what "law" was in view? Merely a "ceremonial" law? No, that is not the case, for subsequently, Paul says: "[F]or I had not known coveting, except the law had said, 'You shall not covet'" (vs. 7; cf. Ex. 20:17).
Clearly, the law to which the Christian is "dead," i.e., separated from, and from which he is "discharged," included the Ten Commandments.
The Christian is not under obligation to keep the sabbath.
Just after he affirmed that the law was "nailed to the cross," Paul declared that no one could "judge," i.e., condemn (cf. Thayer, 361) a Christian for not keeping feast days, sabbaths, etc. (Col. 2:16). That statement could not have been made had the sabbath law still been operative.