This is a historic document that proves the First Assembly kept the Sabbath and the Appointed Times (Holy Days or Feast Days) that are mentioned in Leviticus, chapter 23.
Constantine, a sun worshiper, was responsible for changing the Sabbath from Saturday to Sunday. He also introduced into mainstream Christianity other pagan holidays not commanded in Scripture to be kept, such as Christmas and Easter.
I renounce all customs, rites, legalisms, unleavened loaves of bread and sacrifices of lambs of the Hebrews, and all the other feasts of the Hebrews, sacrifices, prayers, aspirations, purifications, sanctifications, and propitiations, fasts, new moons, Sabbaths, superstitions, hymns and chants, and observances and synagogues. absolutely everything Jewish, every Law, rite, and custom, and if afterward I shall wish to deny and return to Jewish superstition, or shall be found eating with Jews, or feasting with them, or secretly conversing and condemning the Christian religion instead of openly confuting them and condemning their vain faith, then let the trembling of Cain and the leprosy of Gehazi cleave to me, as well as the legal punishments to which I acknowledge myself liable. And may I be an anathema in the world to come, and may my soul be set down with Satan and the devils.” (Stcfano Assemani, Acta Sanctorium Martyrum Orientalium at Occidentalium, Vol. 1, Rome 1748, page 105)
Furthermore, any follower of the “Jewish Messiah” (Yahshua HaMashiach) who wished to join this “holy community” was compelled to adopt a different set of rules and customs. Subsequently, special creeds were drafted, to which the Christian would have to swear such as: “1 accept all customs, rites, legalism, and feasts of the Romans, sacrifices. Prayers, purifications with water, sanctifications by Pontificus Maximus (high priests of Rome), propitiations, feasts, and the New Sabbath “So! dei” (day of the Sun,), all new chants and observances, and all the foods and drinks of the Romans.
In other words, I absolutely accept everything Roman, every new law, rite, and custom, of Rome, and the New Roman Religion.”
Additionally, in approximately 365 AD, the Imperial Church of ROME, Aka Catholic Council of Laodicea wrote, in one of their canons:
Christians must not Judaize by resting on the Sabbath but must work on that day.
Rather, honoring the Lord’s Day.
But if any shall be found to be Judaizers, let them be anathema (against) from Christ”.
Constantine’s Christian Creed