​The law given as part of the Old Covenant no longer is in force (including the Decalogue), since the Old Covenant no longer is in force. 

However, the moral precepts revealed throughout Scripture, which also undergird the Old Covenant, still apply in full force under the God’s overarching command – re-stated multiple times in both the Old and New Testament – to “be holy for I am holy.” 

God’s nature does not change, and neither have His moral precepts …

Given in Scripture as part of His self revelation.