Heb 10:14 14 For by one offering he hath perfected for ever them that are sanctified. Christ's sacrifice or offering makes them He was offered in behalf of Perfect ! Now under the Old Covenant, the types and shadows, those offerings could not make the people perfect, for they must be offered annually because of this defect, for with them there was a remembering of sin year after year, for they could not take away sin so we read Heb 10:1-4 For the law having a shadow of good things to come, and not the very image of the things, can never with those sacrifices which they offered year by year continually make the comers thereunto perfect. 2 For then would they not have ceased to be offered? because that the worshippers once purged should have had no more conscience of sins. 3 But in those sacrifices there is a remembrance again made of sins every year. 4 For it is not possible that the blood of bulls and of goats should take away sins. However this is in strike contrast to the once and forever sacrifice or offering of the Lamb of God, that took away all the sins of the people He was Offered in behalf of Jn 1:29 29 The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world. Yes, even a world of people. This People's sins are remembered no more Heb 8:12. The People are made perfect in contrast to not being made perfect in Heb 10:1 !