Hebrews 7:23

And they have been many priests, on account of being hindered from continuing by death;

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 begot Joiakim, and Joiakim begot Eliashib, and Eliashib begot Joiada,

Hebrews 7:8

And here dying men receive tithes; but there one of whom the witness is that he lives;

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 dying men receive tithes; but there one of whom the witness is that he lives;
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 begot Joiakim, and Joiakim begot Eliashib, and Eliashib begot Joiada,

General references

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