The voice of the nobles was hushed, And their tongue cleaved to the roof of their mouth.
Referenced Verses
Ps 137:6 : 6 Let my tongue cleave to the roof of my mouth, If I remember thee not; If I prefer not Jerusalem Above my chief joy.
Ezek 3:26 : 26 and I will make thy tongue cleave to the roof of thy mouth, that thou shalt be dumb, and shalt not be to them a reprover; for they are a rebellious house.