'Gnashing of Teeth' in the Bible

But the children of the kingdom shall be cast into the outer darkness: there shall be wailing and gnashing of teeth.

and will cast them into a furnace of fire; there shall be wailing and gnashing of teeth.

and shall cast them into a furnace of fire: there shall be weeping and gnashing of teeth.

Then said the king to the servants, Bind his feet and hands, and take him away, and cast him into the darkness, which is without; there shall be weeping and gnashing of teeth.

And will cut him asunder, and give him his portion with the hypocrites: there shall be weeping and gnashing of teeth.

And cast the unprofitable servant into the outer darkness: there shall be weeping and gnashing of teeth.

There shall be wailing and gnashing of teeth, when ye shall see Abraham, and Isaac, and Jacob, and all the prophets, in the kingdom, and yourselves cast out.