15 And the singers+ the sons of Aʹsaph+ were at their office according to the commandment of David+ and of Aʹsaph+ and of Heʹman+ and of Je·duʹthun+ the visionary+ of the king; and the gatekeepers+ were at the different gates.+ There was no need for them to turn aside from their service, because their brothers the Levites themselves prepared+ for them.