'One third' in the Bible

One third you shall burn in the fire at the center of the city, when the days of the siege are completed. Then you shall take one third and strike it with the sword all around the city, and one third you shall scatter to the wind; and I will unsheathe a sword behind them.

One third of you will die by plague or be consumed by famine among you, one third will fall by the sword around you, and one third I will scatter to every wind, and I will unsheathe a sword behind them.