Also Heman and Jeduthun sounded the trumpet, and they played upon the cymbals, and upon every kind of musical instrument, in order to sing praises to God. But the sons of Jeduthun he made to be porters.
Moreover, four thousand were porters. And the same number were the singers of psalms to the Lord, with the musical instruments which he had made for the music.
And they did everything faithfully. Now the overseers of the workers were Jahath and Obadiah, from the sons of Merari, and Zechariah and Meshullam, from the sons of Kohath, who were supervising the work. All were Levites who knew how to play musical instruments.