You mash up the scriptures in Isaiah something dreadful,
God is speaking to those who reject His grace. Who make the sabbath rest yet a day, rather than the day God gives spiritual rest to His people. The Spirit. In the Spirit, speaking in the Spirit, walking in Spirit. Spiritual people in His image for God is Spirit.
This is the sabbath rest of God:
9 To whom will he teach knowledge, and to whom will he explain the message? To children just weaned from milk? To those just taken from the breast?
10 For it is: "Do this and do that, do this and do that, Line upon line, line upon line, a little here, a little there."
11 Very well, then, by strange lips and foreign tongues the LORD will speak to this people
12 to whom he said, "This is the resting place, so give rest to the weary"' and "This is the place of repose"—but they would not listen.
13 So, then, the message from the LORD to them will become: "Do this and do that, do this and do that, line upon line, line upon line, a little here, a little there," so that they will go, but fall backward, and be injured, snared, and captured.
The sabbath rest of God when we cease the natural man and become Spirit.
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8 So then they that are in the flesh cannot please God.
9 But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.