Romans 7:6-7
New King James Version (NKJV)
6 But now we have been delivered from the law, having died to what we were held by, so that we should serve in the newness of the Spirit and not in the oldness of the letter.
7 What shall we say then? Is the law sin? Certainly not! On the contrary, I would not have known sin except through the law. For I would not have known covetousness unless the law had said, “You shall not covet.”
Christians are no longer under the law covenant -
Colossians 2:16-17
New King James Version (NKJV)
16 So let no one judge you in food or in drink, or regarding a festival or a new moon or sabbaths, 17 which are a shadow of things to come, but the substance is of Christ.
The n t does mention that commandment - however
Christians can make that determination- some consider
Saturday the sabbath and others Sunday -
There is no commandment as to the day in the N T
See romans 14:5-----