This is the Decree from the first Pontiff of the Roman church to all the world.
Emperor Constantine, Emperor of the Roman Empire
He had issued an Edict making Sunday the day of rest
In 321 CE, while a Pagan sun-worshiper, the Emperor Constantine declared that Sunday was to be a day of rest throughout the Roman Empire: "On the venerable day of the Sun let the magistrates and people residing in cities rest, and let all workshops be closed. In the country however persons engaged in agriculture may freely and lawfully continue their pursuits because it often happens that another day is not suitable for grain-sowing or vine planting; lest by neglecting the proper moment for such operations the bounty of heaven should be lost."
Council of Laodicea circa 364 CE ordered that religious observances were to be conducted on Sunday, not Saturday. Sunday became the new Sabbath.
They ruled: "Christians shall not Judaize and be idle on Saturday, but shall work on that day."
The first time I heard that there was no scriptural support for the ‘Sunday Sabbath’ I was shocked. When I learned that neither Christmas or Easter had any support either I was further appalled. As far as I am concerned, the lack of scriptural support invalidates any claims the Church may make. I observe Sabbath from sunset Friday until sunset Saturday, as Jesus did. If you are interested I can send you some links justifying the Sabbath from scripture.