Hope these verses will help:
(Luk 6:5) And He said to them, The Son of Man is Lord of the sabbath also.
(Heb 4:1) Therefore, let us fear lest perhaps a promise having been left to enter into His rest, that any of you may seem to come short.
(Heb 4:2) For, indeed, we have had the gospel preached to us, even as they also; but the Word did not profit those hearing it, not having been mixed with faith in the ones who heard.
(Heb 4:3) For we, the ones believing, enter into the rest, even as He said, "As I swore in My wrath, they shall not enter into My rest," though the works had come into being from the foundation of the world. LXX-Psa. 94:11; MT-Psa. 95:11
(Heb 4:4) For He has spoken somewhere about the seventh day this way, "And God rested from all His works in the seventh day." Gen. 2:2
(Heb 4:5) And in this again, "They shall not enter into My rest." MT-Psalm 95:11
(Heb 4:6) Therefore, since it remains for some to enter into it, and those who formerly had the gospel preached did not enter in on account of disobedience,
(Heb 4:7) He again marks out a certain day, saying in David, Today (after so long a time, according as He has said), "Today, if you hear His voice, do not harden your hearts." MT-Psalm 95:7, 8
(Heb 4:
For if Joshua gave them rest, then He would not have afterwards spoken about another day.
(Heb 4:9) So, then, there remains a sabbath rest to the people of God.
(Heb 4:10) For he entering into His rest, he himself also rested from his works, as God had rested from His own. LXX-Psa. 95:11; Gen. 2:2
(Heb 4:11) Therefore, let us exert ourselves to enter into that rest, that not anyone fall in the same example of disobedience.
Arguing over whether the sabbath is on saturday or sunday, I leave to those who still think they are under the law of Moses. Entering into His rest, the sabbath is not a physical day of the week, but every and all the days of our lives. Being in His rest we rest from our works, knowing we can do nothing of ourselves, its all of Him. Jesus healed several people on the sabbath, and the religious people were very angry with Him.
(Gen 2:2) And on the seventh day God completed His work which He had made. And He rested on the seventh day from all His work which He had made.
(Gen 2:3) And God blessed the seventh day and sanctified it, because He rested from all His work on it, which God had created to make.
Many do not enter in His rest on account of disobedience. The law of Moses was fulfilled by Christ, now we are under grace through faith. Should we think of the things of God by the physical or the spirit? Is our Christ alive physically or spiritually? Was His words fleshly or spiritual?
To be crucified with Christ, we put to death this flesh and live as He is, in the Spirit. He is the resurrection and the Life.
Entering into His rest, this flesh is dead. He lives in me now, and I can no longer worship God on a certain day of the week for just a couple hours, or maybe on Wednesday night. We worship God in Spirit and Truth, hopefully 24 hours a day, 7 days a week. This is what is meant as the seventh day sabbath.
Hopefully this will help,
God bless,
Gary