[Cronos]

The Sabbath was not ceremonial

Perhaps English is difficult for you -- I write "the ceremonial aspect of the old law—the Sabbath day itself"

The Sabbath day was the ceremonial aspect of the keeping the Lord's day holy

ceremonial, ceremonious, formal, conventional mean marked by attention to or adhering strictly to prescribed forms. ceremonial and ceremonious both imply strict attention to what is prescribed by custom or by ritual, but ceremonial applies to things that are associated with ceremonies

Col. 2:16-17 16 Therefore do not let anyone judge you by what you eat or drink, or with regard to a religious festival, a New Moon celebration or a Sabbath day. 17 These are a shadow of the things that were to come; the reality, however, is found in Christ.

This says it very clearly - for Christians, Sabbath days were a shadow foreshadowing the first coming of the Christ

For Christians, we now worship the Lord on the FIRST day of the New covenant

[BipolarBob]

Col. 2:16,17 This says it very clearly - for Christians, Sabbath days were a shadow foreshadowing the first coming of the Christ.
Sabbath days plural as there were additional Sabbath days added to the ceremonial laws. These are separate from the weekly Sabbath which is a memorial of Creation. The weekly Sabbath is not a shadow of anything. it is a Law wrote in stone. None of the Mosaic law was wrote in stone and neither was it meant for us. How long will you hold onto that foolish notion?

For Christians, we now worship the Lord on the FIRST day of the New covenant
On whose authority? Where is the command from God? Who told you to worship on that day instead of the Sabbath? Tell me o clever one. Don't tell me He arose on the first day to honor Him. He plainly stated "IF you love Me, keep My Commandments".