We are under the law since Jesus said it is eternal. That is how we know what sin is. We can thank Jesus for his sacrifice so if we accept Him we do NOT have to pay the penalty for breaking the law.
circumcision is an eternal covenant for abraham as well. moses' law is eternal. the levite priesthood is eternal, the sacrifices are always in front of the Lord done by the levites. the solomon temple is forever. yet all arent currently applicable in the church age.
the aaronic priesthood was forever (exodus 40.15) until it was superceded by the melchizedek priesthood with Jesus:
Heb 7:14 For it is evident that our Lord sprang out of Juda; of which tribe Moses spake nothing concerning priesthood.
Heb 7:15 And it is yet far more evident: for that after the similitude of Melchisedec there ariseth another priest,
Heb 7:16 Who is made, not after the law of a carnal commandment, but after the power of an endless life.
Heb 7:17 For he testifieth, Thou art a priest for ever after the order of Melchisedec.
Heb 7:18 For there is verily a disannulling of the commandment going before for the weakness and unprofitableness thereof.
Heb 7:19 For the law made nothing perfect, but the bringing in of a better hope did; by the which we draw nigh unto God.
Heb 7:22
By so much was Jesus made a surety of a better testament.
so just get to rightly dividing the word of truth and the quicker u will get rid of false doctrine.