Genesis 47:24
"And it shall come to pass in the increase, that ye shall give the fifth part unto Pharaoh, and four parts shall be your own, for seed of the field, and for your food, and for them of your households, and for food for your little ones."
Cross References (ranked by relevance)
Let Pharaoh do this, and let him appoint officers over the land, and take up the fifth part of the land of Egypt in the seven plenteous years.
Blessed is he that considereth the poor: the LORD will deliver him in time of trouble.
A good man sheweth favour, and lendeth: he will guide his affairs with discretion.
And they said, Thou hast saved our lives: let us find grace in the sight of my lord, and we will be Pharaoh’s servants.
And concerning the tithe of the herd, or of the flock, even of whatsoever passeth under the rod, the tenth shall be holy unto the LORD.