1 Chronicles 23:4-6

King James Version

⁴ Of which, twenty and four thousand were to set forward the work of the house of the Lord; and six thousand were officers and judges:

⁵ Moreover four thousand were porters; and four thousand praised the Lord with the instruments which I made, said David, to praise therewith.

⁶ And David divided them into courses among the sons of Levi, namely, Gershon, Kohath, and Merari.