The Catechism
Recall the ceremony with which God made known His Law, containing the blessing of the seventh-day Sabbath, by which all humanity is to be judged. Contrast this with the unannounced, unnoticed anticlimax with which the church gradually adopted Sunday at the command of “Christian” emperors and Roman bishops. And these freely admit that they made the change from Sabbath to Sunday.
In the Convert’s Catechism of Catholic Doctrine, we read:
Q. Which is the Sabbath day?
A. Saturday is the Sabbath day.
Q. Why do we observe Sunday instead of Saturday?
A. We observe Sunday instead of Saturday because the Catholic Church, in the Council of Laodicea, (AD 336) transferred the solemnity from Saturday to Sunday….
Q. Why did the Catholic Church substitute Sunday for Saturday?
A. The Church substituted Sunday for Saturday, because Christ rose from the dead on a Sunday, and the Holy Ghost descended upon the Apostles on a Sunday.
Q. By what authority did the Church substitute Sunday for Saturday?
A. The Church substituted Sunday for Saturday by the plenitude of that divine power which Jesus Christ bestowed upon her! —Rev. Peter Geiermann, C.SS.R., (1946), p. 50.
In Catholic Christian Instructed,
Q. Has the [Catholic] church power to make any alterations in the commandments of God?
A. ...Instead of the seventh day, and other festivals appointed by the old law, the church has prescribed the Sundays and holy days to be set apart for God’s worship; and these we are now obliged to keep in consequence of God’s commandment, instead of the ancient Sabbath. —Rt. Rev. Dr. Challoner, p. 211.
In An Abridgment of the Christian Doctrine,
Q. How prove you that the church hath power to command feasts and holy days?
A. By the very act of changing the Sabbath into Sunday, which Protestants allow of; and therefore they fondly contradict themselves, by keeping Sunday strictly, and breaking most other feasts commanded by the same church.
Q. How prove you that?
A. Because by keeping Sunday, they acknowledge the church’s power to ordain feasts, and to command them under sin; and by not keeping the rest [of the feasts] by her commanded, they again deny, in fact, the same power. –Rev. Henry Tuberville, D.D. (R.C.), (1833), page 58.
In A Doctrinal Catechism,
Q. Have you any other way of proving that the Church has power to institute festivals of precept?
A. Had she not such power, she could not have done that in which all modern religionists agree with her. She could not have substituted the observance of Sunday the first day of the week, for the observance of Saturday the seventh day, a change for which there is no Scriptural authority. –Rev. Stephen Keenan, (1851), p. 174.
In the Catechism of the Council of Trent,
The Church of God has thought it well to transfer the celebration and observance of the Sabbath to Sunday! –p 402, second revised edition (English), 1937. (First published in 1566)
In the Augsburg Confession,
They [the Catholics] allege the Sabbath changed into Sunday, the Lord’s day, contrary to the decalogue, as it appears; neither is there any example more boasted of than the changing of the Sabbath day. Great, they say, is the power and authority of the church, since it dispensed with one of the ten commandments. —Art. 28.
God warned that a blasphemous power would “seek to change times and laws,” and the Catholic Church openly admits doing it, even boasts about it. In a sermon at the Council of Trent in 1562, the Archbishop of Reggia, Caspar del Fossa, claimed that the Catholic Church’s whole authority is based upon the fact that they changed the Sabbath to Sunday. Does this not fulfill the prophecies of Daniel and Paul?
“For centuries millions of Christians have gathered to worship God on the first day of the week. Graciously He has accepted this worship. He has poured out His blessings upon Christian people as they have sought to serve Him. However, as one searches the Scriptures, he is forced to recognize that Sunday is not a day of God’s appointment… It has no foundation in Scripture, but has arisen entirely as a result of custom,” says Frank H. Yost, Ph.D. in The Early Christian Sabbath.
Let us ask the question again: Was the Sabbath changed from the seventh day of the week to the first? The Bible is clear: “And God blessed the seventh day and made it holy” (Genesis 2:3). “Therefore the Lord blessed the Sabbath day and made it holy” (Exodus 20:11). If God intended for another day to become the Sabbath, He must have removed the blessing from the seventh day and placed it on the day which was to replace it. But when God bestows a blessing, it is forever. “…You, O Lord, have blessed it, and it will be blessed forever” (1 Chronicles 17:27). “I have received a command to bless; He has blessed, and I cannot change it” (Numbers 23:20). Your birthday, a memorial of your birth, can’t be changed, though you may celebrate it on a different day. Neither can the Sabbath, a memorial of creation (Exodus 20:11), be changed, though some may celebrate it on a different day.
God instructed Moses to construct the earthly sanctuary, all its furniture, and the ark according to “the pattern” he was shown. (Exodus 25:9, 40) The ark was called the “ark of the covenant” (Numbers 10:33, Deuteronomy 10:8, Hebrews 9:4), and the “ark of the testimony” (Exodus 25:22), because in it Moses placed the tablets of stone on which God wrote His Law. (Exodus 25:16, 31:18) John, in Revelation 11:19, describes the scene before him when “the temple of God was opened in Heaven.” John saw the ark of the covenant in the heavenly sanctuary. David wrote, “Your word, O Lord, is eternal; it stands firm in the heavens” (Psalm 119:89). It is safe to assume that God’s Law remains, contained within the ark of the covenant in the heavenly sanctuary.
When God says, “The seventh day is the Sabbath of the Lord your God” (Exodus 20:10), that ends all controversy. We cannot change God’s Word for our own convenience. “But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve” (Joshua 24:15)."
Well; it's in the BOOK a couple of places...
Romans 14:5 (niv)
One person considers one day more sacred than another; another considers every day alike. Each of them should be fully convinced in their own mind.
Acts 15
To the Gentile believers in Antioch, Syria and Cilicia:
Greetings.
24 We have heard that some went out from us without our authorization and disturbed you, troubling your minds by what they said. 25 So we all agreed to choose some men and send them to you with our dear friends Barnabas and Paul— 26 men who have risked their lives for the name of our Lord Jesus Christ. 27 Therefore we are sending Judas and Silas to confirm by word of mouth what we are writing. 28 It seemed good to the Holy Spirit and to us not to burden you with anything beyond the following requirements: 29 You are to abstain from food sacrificed to idols, from blood, from the meat of strangled animals and from sexual immorality. You will do well to avoid these things.
Farewell.