Hebrews 7:12

For when there is a change in the priesthood, there is of necessity a change of the law [concerning the priesthood] as well.

Isaiah 66:21

I will also take some of them as priests and Levites,” says the Lord.

Jeremiah 31:31-34

“Behold, the days are coming,” says the Lord, “when I will make a new covenant with the house of Israel (the Northern Kingdom) and with the house of Judah (the Southern Kingdom),

Ezekiel 16:61

Then you will remember your ways and be ashamed when you receive your sisters, both your older and your younger; I will give them to you as daughters, but not because of your covenant [with Me].

Acts 6:13-14

They presented false witnesses who said, “This man never stops speaking against this holy place and the Law [of Moses];

Treasury of Scripture Knowledge

Summary

For the priesthood being changed, there is made of necessity a change also of the law.

Bible References

A change

Isaiah 66:21
I will also take some of them as priests and Levites,” says the Lord.
Jeremiah 31:31
“Behold, the days are coming,” says the Lord, “when I will make a new covenant with the house of Israel (the Northern Kingdom) and with the house of Judah (the Southern Kingdom),
Ezekiel 16:61
Then you will remember your ways and be ashamed when you receive your sisters, both your older and your younger; I will give them to you as daughters, but not because of your covenant [with Me].
Acts 6:13
They presented false witnesses who said, “This man never stops speaking against this holy place and the Law [of Moses];