I have just read your article on the Sabbath. I am interested to know what you think of Isaiah 56. Is it not new covenant (everlasting name)? This passage is also referring to the foreigner and the eunuch (gentile perhaps). Love to hear your view!

Isaiah 56 is one of many descriptions of the kingdom age. The "new covenant" was given to Judah and to Israel; not to grace age Christians.  This passage is dealing with the earthly Gentiles of the millennial age and not with the church age saints. At that time all the nations of the earth will also come to Jerusalem on the feast of tabernacles to celebrate that feast with Israel. If we are obligated to the Sabbath because of Isaiah 56 (which Paul says we are not - Colossians 2:16-17 [16] 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 days: [17] Which are a shadow of things to come; but the body is of Christ.
See All...), then we are also obligated to go to Jerusalem every fall in order to keep the feast of tabernacles. But there is much more we would also be required to do if you go by these kingdom passages. We cannot take part of it without taking all of it lest we practice dissimulation.

In effect, this would put us entirely under the law again, something we have been delivered from (Romans 6:14-15 [14] For sin shall not have dominion over you: for ye are not under the law, but under grace. [15] What then? shall we sin, because we are not under the law, but under grace? God forbid.
See All...; Galatians 3:23-25 [23] But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed. [24] Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith. [25] But after that faith is come, we are no longer under a schoolmaster.
See All...). And when we come back under the law, we have put ourselves back under the curse (Galatians 3:13Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree:
See All...). The whole idea of us today being under Sabbath Worship is an affront to the blood of Christ and His sacrifice on the cross. It says that His grace was not sufficient.