Where would they ever get that idea?
Latin:
"... Similiter et feriae a fando dicuntur, ob quam causam Silvester papa primus apud Romanos constituit ut dierum nomina quae antea secundum nomina deorum suorum vocabant, id est, Solis, Lunae, Martis, Mercurii, Veneris, Saturni, feria deinceps vocarent, id est, prima feria, secunda feria, tertia feria, quarta feria, quinta feria, sexta feria, quia in principio Genesis scriptum est quod Deus per singulos dies dixerit : prima, Fiat Lux; secunda, Fiat firmamentum; tertia, Producat terra herbam virentem, similiter, etc. Sabbatum autem antiquo legis vocabulo vocare praecepit, et primam feriam diem Dominicam, eo quod Dominus in illa resurrexit. Statuit autem idem papa ut otium sabbati magis in diem Dominicam transferretur, ut ea die a terrenis operibus ad laudandum Deum vacaremus, justa illud quod scriptum est : Vacate et videte, quoniam ego sum Deus (Psal. XLV). ..." - Beati Rabani Mauri, Fuldensis Abbatis et Moguntini Archiepiscopi, de Clericorum Institutione, ad Heistulphum Archiepiscopum; Libri Tres. (Anno 819.) Ad Fratres Fuldenses Epigramma Ejusdem; Liber Secundus, Caput XLVI. Column 361 (Left; PDF page 35) - http://www.documentacatholicaomnia....eistulphum_Archiepiscopum_Libri_Tres,_MLT.pdf
Translated English:
"... Pope Sylvester first among the Romans ordered that the names of the days [of the week], which they previously called after the name of their gods, that is, [the day] of the Sun, [the day] of the Moon, [the day] of Mars, [the day] of Mercury, [the day] of Jupiter, [the day] of Venus, [the day] of Saturn, they should call feriae thereafter, that is the first feria, the second feria, the third feria, the fourth feria, the fifth feria, the sixth feria, because that in the beginning of Genesis it is written that God said concerning each day: on the first, "Let there be light:; on the second, "Let there be a firmament"; on the third, "Let the earth bring forth verdure"; etc. But he [Sylvester] ordered [them] to call the Sabbath by the ancient term of the law, [to call] the first feria the "Lord's day," because on it the Lord rose [from the dead], Moreover, the same pope decreed that the rest of the Sabbath should be transferred rather to the Lord's day [Sunday], in order that on that day we should rest from worldly works for the praise of God.7 ..." - http://biblelight.net/sylvester-I.htm
Roman Catholic Online Encyclopedia:
“...yet we find St. Cæsarius of Arles in the sixth century teaching that the holy Doctors of the Church had decreed that the whole glory of the Jewish Sabbath had been transferred to the Sunday, and that Christians must keep the Sunday holy in the same way as the Jews had been commanded to keep holy the Sabbath Day. … From the eight century the law began to be formulated as it exists at the present day, and the local councils forbade servile work, public buying and selling, pleading in the law courts, and the public and solemn taking of oaths. There is a large body of civil legislation on the Sunday rest side by side with the ecclesiastical. ...” [Roman Catholic Online Encyclopedia; Sunday] - CATHOLIC ENCYCLOPEDIA: Sunday
Council of Trent:
“...But the Church of God has in her wisdom ordained that the celebration of the Sabbath should be transferred to “the Lord's day:” …” [The Catechism of the Council of Trent; On The Third Commandment; pg 267] - The catechism of the Council of Trent : Catholic Church : Free Download, Borrow, and Streaming : Internet Archive
Philip Melanchthon on Daniel 7:25 -
"... But what meaneth the aungell to saye: He shall s•arle or destroye ye hyghe sayn∣tis? verely els but that with his false doctryne capciouse othes articles / & in∣terrogacions he shall fraudelently de∣ceyue and trappe the simple innocents and shed their blode tyrannously. Also he shall arrogantly take vpon him & thin∣ke to change the state of tymes and la∣wes. He weneth to change ye tyme which with swerde and fyer thinketh to shorten the lyfe of man and to preuent and disa∣point gods infallible eternall and immu∣table prouidēce wherby he hath prefiyed euery manis tyme & houre of deth which as noman can differre or prolong it / so cā∣ne noman shorten nor preuent it / except men will make God an ignorant persone and so consequently no god at all. He chā∣geth the tymes and lawes that any of the [page 118-119] sixe worke dayes commanded of god will make them vnholy and idle dayes when he lyste / or of their owne holy dayes abo∣lisshed / make* worke dayes agen / & when they changed ye Saterday into Sondaye / of eting dayes fasting dayes / of mery and glad dayes to marye in / they can make so∣rowfull dayes forbiddinge maryages. They haue changed gods lawes and tur∣ned them into their owne tradiciōs to be kept aboue Gods preceptis. And as for their owne lawes they will change & bre∣ke them when they lyste. And this powr shal anticrist haue whether it be for long or shorte tyme. For so miche sowneth the Hebrew phrase / which is for a tyme / a lyt∣le whyle / & half a tyme / signifyinge that Anticryst shall make lawes to stande as long and as shorte tyme as he listeth and the tymes will he order / sett and change at his owne plesur. But is it not onely ye office of god to chang tymes and lawes? Here is therfore the prophecye fulfylled of him. Euen to exalt himselfe aboue all thing that god is called. This text. But the hyghe saynts he shall tangle trappe & destroye and arrogantly thinke to chan∣ge the tymes and lawes &c. is of diuerse lerned men diuersely translated. ..." - The exposicion of Daniel the prophete gathered oute of Philip Melanchton, Iohan Ecolampadius, Chonrade Pellicane [and] out of Iohan Draconite. [et] c. By George Ioye. A prophecye diligently to be noted of al emprowrs [and] kinges in these laste dayes
