In our text the author is showing the inability of the Old Covenant to completely remove the guilt of the soul.
When the author sat down to write the book of Hebrews (AD 60’s) the Temple still stood in Jerusalem in all of it’s glory. The Temple would be torn down in keeping with Jesus prophecy within a decade. At this point those Jews who embraced Christianity were still very much embracing Judaism as well. So it was common for them to worship at the Temple (or a synagogue) on the Sabbath then to gather with the church on the Lord’s day.
One of the great difficulties early church leaders faced was enabling these people to understand how this ancient religion of Judaism related to this new faith of Christianity.