'One third' in the Bible

And he commanded them, saying, "This is that ye must do: one third part of you shall come on the Sabbath day and keep the watch of the king's house;

One third part within thee shall die of the pestilence and of hunger: Another third part shall be slain down round about thee with the sword: The other third part, that remaineth, will I scatter abroad toward all the winds, and draw out the sword after them.