Jesus is talking about resting from the burden of sin. He makes no mention of the sabbath day here.
You are still reading in to scripture something it does not say.
OK, so let's go at it from another angle - show me chapter and verse from the New Testament that describes the penalty for those that do no observe Saturday sabbath that tells us not observing Saturday sabbath is a sin that sends people to hell.
Here's REST according to the New Covenant... is it's not speaking of keeping Saturday sabbath!
Hebrews 4:4-11
For he spake in a certain place of the seventh day on this wise, And God did rest the seventh day from all his works.
And in this place again, If they shall enter into my rest.
Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief:
Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts.
For if Jesus had given them rest, then would he not afterward have spoken of another day.
There remaineth therefore a rest to the people of God.
For he that is entered into his rest, he also hath ceased from his own works, as God did from his.
Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief.
Hebrews 4:6 tells us "to whom it was first preached entered not in because of unbelief" so those living under the Law of Moses did not enter in to God's REST... even though they were observing Saturday sabbath!
What the Lord's Word is speaking of in Hebrews 4:8 is what we have under the New Covenant which is resting in faith IN Christ... not just one day a week, but ALL days.
Therefore Saturday sabbath does not meet the higher standards Jesus Christ has brought forth for His people in the New Covenant due to it';s better promises.
Maybe some day... the sabbatarians can come on over in to the New Covenant and let Jesus be their High Priest rather than trying to go back and live under Moses.
Under the Law of Moses... Saturday sabbath was a thing.
Under the Law of Christ (New Covenant), it is NOT a thing because a different rest has replaced Saturday sabbath which made it obsolete since we are IN Christ now and ... HE is out rest... HE is our sabbath 24/7/365 (Mat 11:28, Hebrews 4:9-11)