'Gnashing of Teeth' in the Bible

but the children of the kingdom shall be cast into the darkness outside; there shall be weeping and gnashing of teeth.

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

and cast them into the furnace of fire; there shall be weeping and gnashing of teeth.

Then the king said to the servants, Bind his feet and hands, and cast him into the darkness outside. There shall be weeping and gnashing of teeth.

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