1 Chronicles 23:2

Now David was old and full of days; and he made Solomon his son king over Israel.

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

David said, “Of these, twenty-four thousand were to oversee the work of the LORD’s house, six thousand were officers and judges,

four thousand were doorkeepers, and four thousand praised the LORD with the instruments which I made for giving praise.”