The seventh day of the week—the Sabbath—was set apart at creation as being blessed, sanctified, and holy (Genesis 2:3; Exodus 20:11). It was given to Israel prior to the Old Covenant (Exodus 16), and confirmed within a separate perpetual covenant (Exodus 31:12-17). It was observed by God's people throughout biblical history, and transgressed by the disobedient. Jesus kept the seventh-day Sabbath, as did the apostles and early church after His death. Prophecies show that it will continue to be kept when He returns to establish His Kingdom on earth.
In the face of the Bible's consistent teaching, though, Protestant theologians justify their breaking of the fourth commandment and their worship on the first day of the week by saying that they are honoring the day of Christ's resurrection. They offer this reason despite there being absolutely no indication that God intended such a change, nor is there any explanation from an apostle, prophet, or other messenger after the fact to reveal such a doctrinal deviation—one that would have lit an unthinkable doctrinal firestorm in the first century.
Their inadequate reasoning contains more holes. While the day and time of Christ's resurrection are critical to our salvation, they are central for a different reason than the one given by the theologians. By Jesus' own testimony, the true significance of the day and time of His resurrection is that it proves that He was who He claimed to be: the Son of Man, the Messiah. The sign He gave of His Messiahship is that He would be in the grave three days and three nights (that is, 72 hours), and then God would resurrect Him.
Therefore, the timing of His resurrection has nothing to do with establishing which day God set apart and made holy, and everything to do with whether He was and is the Messiah. The day and time of His resurrection either prove or disprove His Messiahship—in Christ's words, the holiness of the day is nowhere in view. Followers of Christ should be keen, then, on understanding how long He was in the grave and when He was resurrected, for if the Father did not resurrect Jesus when He foretold, we have no Savior.
Now we arrive at a poignant irony: The same theologians that justify Sunday-observance (on the basis of Christ's resurrection) also claim that He died on a Friday afternoon and was resurrected on a Sunday morning—that is, that Jesus did not fulfill the sign of Jonah! Notice He did not foretell "parts of three days" or even just "three days" but "three days and three nights." It is simply not possible to fit three days and three nights between a Friday afternoon and a Sunday morning. These theologians have a couple of serious problems on their hands and heads, not only in attempting to change times and laws (see Daniel 7:25), but also by invalidating the very sign Jesus gave to prove who He was!
Reconciling the correct timing of Jesus's burial and resurrection takes some deeper study, but it is not difficult. We know that He was killed on the day of Passover and that His body was put into the grave before sunset (compare Mark 15:42; Luke 23:54; John 19:14). His burial needed to take place before sunset because that marked the end of the day of Passover (a preparation day) and the beginning of a Sabbath. That Sabbath was not a weekly Sabbath, though, but rather an annual one, the first day of the Feast of Unleavened Bread. John confirms this by recording that "that Sabbath was a high day" (John 19:31).
This means there are two Sabbaths involved in the timing—an annual Sabbath (the first day of Unleavened Bread) and a weekly Sabbath. Jesus suffered crucifixion on the preparation day for an annual Sabbath rather than the weekly Sabbath, thus He did not die on a Friday, as is commonly believed. In the year of His crucifixion, Passover was on a Wednesday. His body was put into the grave late Wednesday afternoon before the high-day Sabbath began. He was in the grave three days and three nights (Wednesday night through Saturday; 72 hours), and He arose on Sabbath afternoon just before sunset.
As After Three Days explains, Sabbath afternoon is the only time when Jesus could have been resurrected after being killed on Passover afternoon and lying in the grave three days and three nights. Yet, His resurrection on the Sabbath is not what makes it holy and set apart. Rather, He was resurrected by God on the day that was already holy and set apart. So, the day of Christ's resurrection does not establish the day of worship—yet even if it did, it would still be on the seventh day!
Whether by assumed church authority or by carelessly handling the Word of God, Sunday-keeping is a tradition of men rather than an ordinance of God. Jesus says, "If you love Me, keep My commandments" (John 14:15), including the ten He gave at Mount Sinai. The apostle John concurs: "By this we know that we love the children of God, when we love God and keep His commandments. For this is the love of God, that we keep His commandments. And His commandments are not burdensome" (I John 5:2-3). Yet, church leaders for centuries, like the Pharisees before them, have led millions into error by making "the commandment of God of no effect by [their] tradition" (Matthew 15:6).
Jesus' resurrection made no change in the day of worship; men took it upon themselves to change it without respect to God's Word. In the near future, however, when Christ returns, all who claim Him as King will once again hallow the Sabbath (Isaiah 66:22-23; Ezekiel 44:24; 45:17; 46:3).
