Ibrani 6:19

6:19 We have this hope as an anchor for the soul, sure and steadfast, which reaches inside behind the curtain, ¹ 

Ibrani 7:28

7:28 For the law appoints as high priests men subject to weakness, ²  but the word of solemn affirmation that came after the law appoints a son made perfect forever.

[6:19]  ¹ sn The curtain refers to the veil or drape in the temple that separated the holy place from the holy of holies.

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