I just want to make sure there's no confusion here.
Sorry, I do not recognize "the Sabbath of the Lord" as you put it, nor do I accept the mark thereof.
I accept the seventh day sabbath as appointed by Yahuah (sounds like Yahuwah), and established from the beginning, put into the 10 Commandments with His own finger, is part of the Appointed Times (mow'ed), and will be observed in the new heavens and new hearth as well. This is the sign between me and Yah that He is my Elohim, my Abba, and I am His child. I belong to no other.
Exo 20:10 But the seventh day is the Sabbath of YHWH thy Elohim: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:
Exo 20:11 For in six days YHWH made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore YHWH blessed the Sabbath day, and hallowed it.
Exo 31:16 Wherefore the children of Israel shall keep the Sabbath, to observe the Sabbath throughout their generations, for a perpetual covenant.
Exo 31:17 It is a sign between me and the children of Israel for ever: for in six days YHWH made heaven and earth, and on the seventh day he rested, and was refreshed.
Eze 20:12 Moreover also I gave them my Sabbaths, to be a sign between me and them, that they might know that I am YHWH that sanctify them
Eze 20:20 And hallow my Sabbaths; and they shall be a sign between me and you, that ye may know that I am YHWH your Elohim.