1 Chronicles 23:2-5

2And he gathered together all the leaders of Israel, with the priests and the Levites.

3Now the Levites were numbered from the age of thirty years and above; and the number of individual males was thirty-eight thousand.

4Of these, twenty-four thousand were to look after the work of the house of the Lord, six thousand were officers and judges,

5four thousand were gatekeepers, and four thousand praised the Lord with musical instruments, “which I made,” said David, “for giving praise.”