'Gnashing' in the Bible

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

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

And shall cast them into the furnace of fire: there shall be wailing and gnashing of teeth.

Then said the king to the servants, Bind him hand and foot, and take him away, and cast him into outer darkness; there shall be weeping and gnashing of teeth.

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

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

There shall be weeping and gnashing of teeth, when ye shall see Abraham, and Isaac, and Jacob, and all the prophets, in the kingdom of God, and you yourselves thrust out.