The Law = we are free from it by grace, When Jesus died on the cross He paid the penalty of transgressing the law. It doesn't matter which law it is paid in full. It is because the law of the ten commandments can not be removed or changed that Christ needed to die. It was the only way to save us from the law.
This makes the law seem like our enemy and a bad thing, but i'll quote Paul.
Rom 6:11 Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.
Rom 6:12 Let not sin therefore reign in your mortal body, that ye should obey it in the lusts thereof.
Rom 6:13 Neither yield ye your members as instruments of unrighteousness unto sin: but yield yourselves unto God, as those that are alive from the dead, and your members as instruments of righteousness unto God.
Rom 6:14 For sin shall not have dominion over you: for ye are not under the law, but under grace.
Rom 6:15 What then? shall we sin, because we are not under the law, but under grace? God forbid.
Rom 7:4 Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God.
Rom 7:5 For when we were in the flesh, the motions of sins, which were by the law, did work in our members to bring forth fruit unto death.
Rom 7:6 But now we are delivered from the law, that being dead wherein we were held; that we should serve in newness of spirit, and not in the oldness of the letter.
Rom 7:7 What shall we say then? Is the law sin? God forbid. Nay, I had not known sin, but by the law: for I had not known lust, except the law had said, Thou shalt not covet.
Rom 7:8 But sin, taking occasion by the commandment, wrought in me all manner of concupiscence. For without the law sin was dead.
Rom 7:9 For I was alive without the law once: but when the commandment came, sin revived, and I died.
Rom 7:10 And the commandment, which was ordained to life, I found to be unto death.
Rom 7:11 For sin, taking occasion by the commandment, deceived me, and by it slew me.
Rom 7:12 Wherefore the law is holy, and the commandment holy, and just, and good.
Rom 7:13 Was then that which is good made death unto me? God forbid. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceeding sinful.
Rom 7:14 For we know that the law is spiritual: but I am carnal, sold under sin.
Yes we are free from the law. Yes we are not held by the laws penalty of death because of Jesus. But like Paul say's
Rom 6:13 Neither yield ye your members as instruments of unrighteousness unto sin: but yield yourselves unto God, as those that are alive from the dead, and your members as instruments of righteousness unto God.
If keeping the sabbath is righteousness we should try to obey not to avoid the penalty but because we are walking in the Spirit as instruments of righteousness unto God.