Hebrews 7:12

For [when] the priesthood changes, of necessity there is a change of the law also.

Isaiah 66:21

And indeed, I will take some of them as priests [and] the Levites," says Yahweh.

Jeremiah 31:31-34

Look, [the] days [are] coming," {declares} Yahweh, "and I will {make} a new covenant with the house of Israel and with the house of Judah,

Ezekiel 16:61

And you will remember your ways, and you will be ashamed when you take your sisters, {both the older and the younger}, and I give them to you as daughters, but not on account of your covenant.

Acts 6:13-14

And they put forward false witnesses who said, "This man does not stop speaking words against the holy place and the law!

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
And indeed, I will take some of them as priests [and] the Levites," says Yahweh.
Jeremiah 31:31
Look, [the] days [are] coming," {declares} Yahweh, "and I will {make} a new covenant with the house of Israel and with the house of Judah,
Ezekiel 16:61
And you will remember your ways, and you will be ashamed when you take your sisters, {both the older and the younger}, and I give them to you as daughters, but not on account of your covenant.
Acts 6:13
And they put forward false witnesses who said, "This man does not stop speaking words against the holy place and the law!