2 Chronicles 35:15
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.
And the singers the sons of Asaph were in their place,.... In the court of the priests, singing and playing on their instruments while the sacrifices were offering:
according to the commandment of David, and Asaph, and Heman, and Jeduthun the king's seer; the same with Ethan; and everyone were seers, as Jarchi interprets it, that is, the three last:
and the porters waited at every gate; such of the Levites as were in, that post and office:
they might not depart from their service; to let people in and out, that came for their passover lamb, and share in their other offerings:
for their brethren the Levites prepared for them; because they were not at leisure to prepare for themselves.