The Inauguration of the Sabbath Day

The day of the Sabbath is not a disputable matter, it is a Commandment of Yahweh which has never been questioned by the Jews, including Yahshua. There has never been any evidence that Yahweh or Yahshua ever changed the day or abolished it.
Genesis 2:2-3: Here we read that Yahweh rested on the seventh day, which is Saturday, after He had spent six days creating the world and its environment. He blessed the day and made it holy.
Exodus 16:23-30: When in the wilderness Yahweh instructed Moses that the people should rest on the seventh day, collecting manna on Friday morning for two days so that they would not have to go out on the holy Sabbath day to gather food.
Exodus 20:8-11: This scripture of course is the apex of teaching on the subject, as the seventh day Sabbath is one of the Ten great Commandments written on stone. This commandment is emphasized and explained perhaps more than any of the others. "Remember the sabbath day, to keep it holy. Six days shalt you labor, and do all your work; but the seventh day is a sabbath unto Yahweh your Elohim (Heb)/God(Greek): You shall not do any work, you, or your son, or your daughter, your man-servant, or your maid-servant, or your cattle, or the stranger(there is no circumcision required to keep the Sabbath) that is within your gates: for in six days Yahweh made heaven and earth, the sea, and all that in them is, and rested the seventh day: therefore Yahweh blessed the sabbath day, and hallowed it." Yahweh 'nailed it down' pretty tightly!
Yahweh feels so strongly about this commandment that He instructs His people that even strangers visiting their homes should be subjected to the Sabbath day instructions and not work.
Leviticus 23:3: In the famous 'Feast' chapter, Yahweh again emphasises that the seventh day Sabbath should be regarded as holy and as one of the Feast days to be kept forever by His people.
Isaiah 58:13-14:In this chapter more light is shed on how we are to keep the day holy unto Yahweh. It is both helpful and illuminating: "If you turn away your foot from the sabbath, from doing your pleasure on my holy day; and call the sabbath a delight, the holy of Yahweh, honorable; and shall honour it, not doing your own ways, nor finding your own pleasure, nor speaking your own words: then you shall delight yourself in Yahweh; and I will make you to ride upon the high places of the earth; and I will feed you with the heritage of Jacob your father: for the mouth of Yahweh hath spoken it."
Luke 4:16: Yahshua regularly taught in the synagogues on the Sabbath day. It was a day for hearing the scriptures being expounded by the rabbis which of course included Him. The people often called Him 'Rabbi' and so He was. Other examples can be found in: Mark 1:21, Mark 6:2, Luke 4:31, Luke 6:6, Luke 13:10, and John 5:14.
Acts 13:14: Paul and Barnabas also observed the Sabbath and taught as Yahshua did in the synagogues. See Acts 16:13, Acts 17:2, Acts 18:4 Decisions about changing the Sabbath day have been purely a 'gentile' thing, and the nations will one day answer for the changes they have made. According to the end of the Book of Revelation, we are instucted not to add or take away from the Word of Yahweh found in the Torah and the New Testament (Covenant).