Hebrews 7
9 Ref And we may say that in Abraham, even Levi, who has a right to take the tenth part, gave it;
10 Ref Because he was still in his father's body when Melchizedek came to him.
11 Ref Now if it was possible for things to be made complete through the priests of the house of Levi (for the law was given to the people in connection with them), what need was there for another priest who was of the order of Melchizedek and not of the order of Aaron?
12 Ref Because if the priests are changed, it is necessary to make a change in the law.