Throw it out, no it was fulfilled . Read the book of Hebrews.
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Oh, you mean this?
Heb 7:12 For the priesthood being changed, there is made of necessity a change also of the law.
The Law was not done away, it was changed concerning who it applied to. First thing we need to determine is what Law is being spoken of here. Why don't we check the context?
Heb 7:11 If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need was there that another priest should rise after the order of Melchisedec, and not be called after the order of Aaron?
Hmmm, something about the Levitical Priesthood?
Heb 7:13 For he of whom these things are spoken pertaineth to another tribe, of which no man gave attendance at the altar.
Heb 7:14 For it is evident that our Lord sprang out of Juda; of which tribe Moses spake nothing concerning priesthood.
Well, what do you know, it is talking about this Law...
Exo 28:1 "Now take Aaron your brother, and his sons with him, from among the children of Israel, that he may minister to Me as priest, Aaron and Aaron's sons: Nadab, Abihu, Eleazar, and Ithamar.
The Law being spoken of here is a Law of DNA. Only Levites and specifically, those with Aaron's DNA, could be Priests and be ministers. Now in Hebrews 7 we read that Christ replaced the human High Priest...
Heb 7:11 Therefore, if perfection were through the Levitical priesthood (for under it the people received the law), what further need was there that another priest should rise according to the order of Melchizedek, and not be called according to the order of Aaron?
Heb 7:12
For the priesthood being changed, of necessity there is also a change of the law.
Heb 2:14 Inasmuch then as the children have partaken of flesh and blood, He Himself likewise shared in the same, that through death He might destroy him who had the power of death, that is, the devil,
Heb 2:15 and release those who through fear of death were all their lifetime subject to bondage.
Heb 2:16 For indeed He does not give aid to angels, but He does give aid to the seed of Abraham.
Heb 2:17 Therefore, in all things He had to be made like His brethren, that He might be a merciful and faithful High Priest in things pertaining to God, to make propitiation for the sins of the people.
Heb 3:1 Therefore, holy brethren, partakers of the heavenly calling, consider the Apostle and High Priest of our confession, Christ Jesus,
Heb 4:14 Seeing then that we have a great High Priest who has passed through the heavens, Jesus the Son of God, let us hold fast our confession.
Christ has become the High Priest and since the Law of the Priesthood says that only a Levite and specifically, only a son of Aaron could be a Priest and Christ was from the tribe a Judah (a Jew), the Law had to be changed, not done away or made of no effect.
Christ will not compromise one iota (a jot) with His Law (and it is His Law, He was the One who spoke that Law from Sinai). So the Law was changed because Christ will not violate the smallest part ( a jot or tittle) of His Law.