Hebrews 10:9

Then hath he said, Lo I come to do thy will. He taketh away the first that he may establish the second.

In this verse it is plain why the parenthesis was introduced in the verse above; it was to show that "the first" does not apply to sacrifices, offerings, or the ceremonial part of the Jewish institution, nor to the law concerning priests, but to the first "law," that entire covenant with its ten commandments and everything else that pertained to it.