Col 2 speaks of sabbath days nailed to the cross ,
this was part of the Old Covenant ,also know as sabbath says with an "S"
so before they teach what ended at the cross ,,they should know the difference in the book of law handwritten by Moses in a Book ,,and the 10 written in stone ,not once but twice by Gods own finger ,,,showing they are unchangeable (remember the broken tablets were placed in an Ark ,remember what happened to anyone who touched the Ark?