The law under the Levitical priesthood which is the law of Moses. Deut 31:24-26.You can't separate the commandments of God from an (unchanged) law, even though we are told that the law has changed.
One law He came to magnify Isa 42:21 the one He wrote with His own finger Exo31:18 and is under His mercy seat. We see examples of Him doing so with the Ten Commandments, not a jot or tittle can pass Mat5:18-30 as if man can edit and improve what was written by the Holy Spirit.
He came to put an end to another law Dan9:27, the law Moses wrote in a book that was placed besides the ark there as a witness against you, obviously two different laws that served different purposes that the Bible explains if we allow it to.