Bible Verses About Priests: Services of, ineffectual for removing sin

Now if perfection could have been attained through the Levitical priesthood (for on this basis the people received the law), why was there still need for another priest to appear—one in the order of Melchizedek and not in the order of Aaron?

Day after day every priest stands to minister and to offer again and again the same sacrifices, which can never take away sins.