1 Chronicles 23:27

For by the last words of David the sons of Levi were numbered, from twenty years old and upward.

1 Chronicles 23:24

These were the sons of Levi after their fathers' houses, even the heads of ancestral houses of those who were counted individually, in the number of names by their polls, who did the work for the service of the house of the LORD, from twenty years old and upward.

2 Samuel 23:1

Now these are the last words of David. David the son of Jesse says, the man who was raised on high says, the anointed of the God of Jacob, the sweet psalmist of Israel:

1 Chronicles 23:3

The Levites were numbered from thirty years old and upward: and their number by their polls, man by man, was thirty-eight thousand.

Psalm 72:20

This ends the prayers by David, the son of Jesse.

Treasury of Scripture Knowledge

Summary

For by the last words of David the Levites were numbered from twenty years old and above:

General references

Bible References

By the last

1 Chronicles 23:3
The Levites were numbered from thirty years old and upward: and their number by their polls, man by man, was thirty-eight thousand.
2 Samuel 23:1
Now these are the last words of David. David the son of Jesse says, the man who was raised on high says, the anointed of the God of Jacob, the sweet psalmist of Israel:
Psalm 72:20
This ends the prayers by David, the son of Jesse.

General references

Numbers 4:35
from thirty years old and upward even to fifty years old, everyone who entered into the service, for work in the Tent of Meeting.