NIV Matthew 5:
Hebrews 7:
No, Hebrews 7:12 does not say that the letters of the written code of the Mosaic law have changed. It says that the change of priesthood implies a change of the covenant (law).
Jesus was talking about the letters of the written code of the Mosaic law.18 For truly I tell you, until heaven and earth disappear, not the smallest letter, not the least stroke of a pen, will by any means disappear from the Law until everything is accomplished.
Hebrews 7:
What law? Does this contradict Matthew 5:18?11 If perfection could have been attained through the Levitical priesthood—and indeed the law given to the people established that priesthood—why was there still need for another priest to come, one in the order of Melchizedek, not in the order of Aaron? 12For when the priesthood is changed, the law must be changed also.
No, Hebrews 7:12 does not say that the letters of the written code of the Mosaic law have changed. It says that the change of priesthood implies a change of the covenant (law).