The singers, the descendants of Asaph, were at their stations according to the command of David, Asaph, Heman, and Jeduthun the king’s seer. And the gatekeepers at each gate did not need to leave their posts, because their fellow Levites made preparations for them.
KJV
And the singers the sons of Asaph [were] in their place, according to the commandment of David, and Asaph, and Heman, and Jeduthun the king’s seer; and the porters [waited] at every gate; they might not depart from their service; for their brethren the Levites prepared for them.
ASV
And the singers the sons of Asaph were in their place, according to the commandment of David, and Asaph, and Heman, and Jeduthun the king’s seer; and the porters were at every gate: they needed not to depart from their service; for their brethren the Levites prepared for them.