NET
45 They performed the service of their God and the service of purification, along with the singers and gatekeepers, according to the commandment of David and his son Solomon.
Darby
45 And, with the singers and the doorkeepers, they kept the ward of their God, and the ward of the purification, according to the commandment of David [and] of Solomon his son.
KJV
45 And both the singers and the porters kept the ward of their God, and the ward of the purification, according to the commandment of David, [and] of Solomon his son.