Why so much fuss and contention over "which" day mankind should "keep" sacred in honor and reverence to a Holy God... Who clearly and specifically defines it as the "seventh" (7th) day? Are we not able to count to seven? Are we so steeped in our own opinions that we seriously consider "our" views superior to YHWH's (if not in agreement with God's). Do we not realize that YHWH, the supreme authority and King of the Universe... who created everything in the Heavens, in the Earth and Under the Earth, He alone gets to make the "rules" and we only get to make the choices to "obey," and be in His Favor; or "disobey," and be out of His Favor... I.E. the issue of His response to the offerings of Able and Cain... with Able's offering being accepted and Cain's offering be rejected; and YHWH admonished Cain:  

Gen 4:6-7

6 And the LORD said unto Cain, Why art thou wroth? and why is thy countenance fallen? 7 If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door..." KJV  

The "sin" that lies at our door is always the result of our "transgression" of the Torah (Law)  

1 John 3:4

4 Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law. KJV  

The 4th Commandment is to Keep the Sabbath... so, we who do not "keep" the Biblical 7th day Sabbath very simply are "transgressors of the Law (Torah)." The only avenue out is to repent and correct our transgression.  

It is of great interest to me that the Roman Catholic Church (who unashamedly admit they changed the Sabbath day from Saturday, the 7th day commanded, to the 1st day of Sunday) say that if you are not a Catholic and keep the Roman Church appointed Sunday "Sabbath," that you are in violation of the scriptures if you do not keep the 7th day the Bible commands... if you think about this for a few minutes, you will no doubt ask yourself, "who gave them authority to override the Torah of YHWH?" And, how do they consider a Sunday Sabbath Protestant in Scriptural violation for acting just like they do, as they promote the distortion of the "forever settled Word of YHWH," (Ps 119:89). Of course, this is only one thing, among many, that the Roman Church did/does that polluted the Holy authority of the Torah.  

The more stunning issue (if it were not so tragic and disgraceful as an action and orthodox practice on the institutional church) is that Protestant defenders of the Sunday Sabbath have absolutely no Biblical Scriptures (that are not allegorized) that support their position on a Sunday 1st day Sabbath. The Torah says two times in Deuteronomy to not add anything to the Torah/Law and not to take anything from it...(Deut 4:2, 12:32). Yeshua (Jesus) in Mat 5:17-20, explicitly warns of the consequences of tinkering with His (YHWH's) commandments... ARE WE LISTENING! Do we think we will draw a "pass" for these rebellious attitudes at our "face to face" meeting with Him on the day of Judgment? Are we willing to surrender our destiny to faulty and erroneous doctrines of "popular" preachers and so called "learned" instructors of Seminaries, just to stay in good standing with men? Was it not the "learned" and "instructors" of the Religious Institutions of Yeshua's day that rejected His very own person... is this line of reasoning not what we are watching in our day?  

Jer 16:19

19 O LORD, my strength, and my fortress, and my refuge in the day of affliction, the Gentiles shall come unto thee from the ends of the earth, and shall say, Surely our fathers have inherited lies, vanity, and things wherein there is no profit. KJV  

The "bold" emphasis is mine... Yes, we have surely inherited lies, vanity and things wherein there is no profit... it is the work of men and the pride of men and their egos and their need to control others under their authority and influence that enslaves people to "laws" of men (the very legalism they propose the Torah compliant persons as following, is the hook that the devil uses to bind them to men's legalism itself; a Sunday Sabbath is a doctrine of men and legalism at the core)... we must return to the freedom of the Torah for Holy "instruction" in our walk of faith. Somehow, to me, it is the Sabbath that is the "linchpin" of understanding that YHWH has used to test us as a faithful people, as he declares that His Sabbaths (not the Jews Sabbath), is a sign between Him and His people throughout their generations:  

Ex 31:13

13 Speak thou also unto the children of Israel, saying, Verily my sabbaths ye shall keep: for it is a sign between me and you throughout your generations; that ye may know that I am the LORD that doth sanctify you. KJV  

Ezek 20:12

12 Moreover also I gave them my sabbaths, to be a sign between me and them, that they might know that I am the LORD that sanctify them. KJV  

YHWH never changes:  

Mal 3:6

6 For I am the LORD, I change not; therefore ye sons of Jacob are not consumed.

Heb 13:8

8 Jesus Christ the same yesterday, and to day, and for ever. KJV

How do we properly "keep" (observe) the Sabbath?