Hebrews 7:23

And they indeed have been made priests many in number, because that by death they are hindered from continuing:

1 Chronicles 6:3-14

And the children of Amram: Aaron, and Moses, and Miriam. And the sons of Aaron: Nadab, and Abihu, Eleazar, and Ithamar.

Nehemiah 12:10-11

And Jeshua begat Joiakim, and Joiakim begat Eliashib, and Eliashib begat Joiada,

Hebrews 7:8

And here men that die receive tithes; but there one, of whom it is witnessed that he liveth.

Treasury of Scripture Knowledge

Summary

And they truly were many priests, because they were not suffered to continue by reason of death:

General references

Bible References

Were

Hebrews 7:8
And here men that die receive tithes; but there one, of whom it is witnessed that he liveth.
1 Chronicles 6:3
And the children of Amram: Aaron, and Moses, and Miriam. And the sons of Aaron: Nadab, and Abihu, Eleazar, and Ithamar.
Nehemiah 12:10
And Jeshua begat Joiakim, and Joiakim begat Eliashib, and Eliashib begat Joiada,

General references

Numbers 20:26
and strip Aaron of his garments, and put them upon Eleazar his son: and Aaron shall be gathered unto his people , and shall die there.
Zechariah 1:5
Your fathers, where are they? and the prophets, do they live for ever?

American Standard Version Public Domain