Cross reference
1 Chronicles 23:27
27 For by the last words of David the sons of Levi were numbered, from twenty years old and upward.
1 Chronicles 23:24
24 These were the sons of Levi after their fathers' houses, even the heads of the fathers' [houses] of those of those who were counted, in the number of names by their polls, who did the work for the service of the house of Yahweh, from twenty years old and upward.
2 Samuel 23:1
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
3 The Levites were numbered from thirty years old and upward: and their number by their polls, man by man, was thirty-eight thousand.
Psalms 72:20
20 This ends the prayers by David, the son of Jesse.