Jesus wasn’t a Sabbatarian — . Jesus is the fulfillment of the Sabbath rest in the sense that only he can actualize the “rest” the Sabbath symbolized.
In Hebrews 10:1-26, we see movement toward tagging on the Church as fulfillment of all that was merely shadow in the Old Covenant and not just Jesus Christ in the abstract. And this makes sense only when we understand that “the Church” is the body of Christ, or Christ himself extended into the world (cf. Eph. 1:22-23).
For since the law has but a shadow of the good things to come, instead of the true form of those realities, it can never . . . make perfect those who draw near.
Therefore, brethren, since we have confidence to enter the sanctuary by the blood of Jesus, by the new and living way which he opened for us through the curtain, that is, through his flesh, and since we have a great high priest over the house of God, let us draw near with a true heart in the full assurance of faith, with our hearts sprinkled clean from an evil conscience and our bodies washed with pure water . . . not neglecting to meet together, as is the habit of some. . . . For if we sin deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins (Heb. 10:1; 19-22, 25-26).
As Christians, we “enter into the sanctuary” through baptism—bodies washed with pure water—and the Eucharist—his flesh—thus enters the necessity of the Church.
Christ perfectly observed the Sabbath as he did all of the old covenant. However, after he enunciated a new covenant at the Last Supper, his emphasis seems to be on Sundays. Sunday was the day he was found to have been resurrected, and his first two appearance to the twelve disciples were on the following two Sundays (Jn. 20:19, 20:26). Again, five weeks later—on Sunday—the Holy Spirit descended on the apostles.
O foolish Galatians, who hath bewitched you, that ye should not obey the truth?
"For if we sin deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins"
Did you read that? If we sin. How do we know if we sin? 1 John 3:4 tells us sin is the transgression of the law. So we have to refer back to the law to see what is sin. But you (Catholics) are telling people to deliberately sin by not worshiping God on the Sabbath. Who is it now that is in jeopardy of Hell? If you read the Word of God, it ain't me.