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Not sure why you would say the Sabbath does not have to be kept or observed ... God completed ALL things in 6 days- it was done / nothing left for Him to do! Then why literally create another day?
Because He created the only Holy Day for mankind. He literally placed another day, a Holy day on His calendar... there will always be 7 days- before and after the Cross! The New Covenant did not eliminate or replace the Sabbath... this day is a blessing from Him forever.... that is unless you decide it isn’t—- but why would anyone want to do that?