Where in the New Testament does it say that Christians are subject to the sabbath?
Exodus 20, the 4th commandment, the longest commandment says:
Exo 20:8 Remember the sabbath day, to keep it holy.
Exo 20:9 Six days shalt thou labor, and do all thy work: Exo 20:10 But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:
Exo 20:11 For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
God made the 7th day holy. It's not my task to prove it's still holy to Christians. It's your task to prove from scripture that it is not holy. Where does it say in scripture that it's not holy to Christians?