'Fifth' in the Bible

And there was evening, and there was morning, a fifth day.

And God listened to Leah and she conceived and gave birth to a fifth son for Jacob.

And it shall happen [that] at the harvest, you must give a fifth to Pharaoh and four-fifths shall be yours, as seed for the field and for your food and for those who [are] in your households, and as food for your little ones."

So Joseph made it a statute unto this day concerning the land of Egypt: one fifth to Pharaoh. Only the land of the priests alone did not belong to Pharaoh.