Hebrews 7:19

7:19 for the law made nothing perfect. On the other hand a better hope is introduced, through which we draw near to God.

Hebrews 7:28

7:28 For the law appoints as high priests men subject to weakness, ¹  but the word of solemn affirmation that came after the law appoints a son made perfect forever.

Hebrews 10:1

Concluding Exposition: Old and New Sacrifices Contrasted

10:1 For the law possesses a shadow of the good things to come but not the reality itself, and is therefore completely unable, by the same sacrifices offered continually, year after year, to perfect those who come to worship. ² 

[7:28]  ¹ sn See Heb 5:2 where this concept was introduced.

[10:1]  ¹ tn Grk “those who approach.”