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.