פירוש על דברי הימים א 16:42

were [appointed] over the gate like “for gate sentries”; and in the fortieth year of the kingdom of the house of David, they made them the heads of the singers, as it is written (below 25:3): “Of Jeduthun: the sons of Jeduthun, etc., six alongside, etc., who prophesied by the thanksgiving and praise to the Lord.”