Genesis 26:16 (KJV)

And Abimelech charged all his people, saying, He that toucheth this man or his wife shall surely be put to death.

Then Isaac sowed in that land, and received in the same year an hundredfold: and the LORD blessed him.

And the man waxed great, and went forward, and grew until he became very great:

For he had possession of flocks, and possession of herds, and great store of servants: and the Philistines envied him.

For all the wells which his father's servants had digged in the days of Abraham his father, the Philistines had stopped them, and filled them with earth.

And Isaac departed thence, and pitched his tent in the valley of Gerar, and dwelt there.

And Isaac digged again the wells of water, which they had digged in the days of Abraham his father; for the Philistines had stopped them after the death of Abraham: and he called their names after the names by which his father had called them.

And Isaac's servants digged in the valley, and found there a well of springing water.

And the herdmen of Gerar did strive with Isaac's herdmen, saying, The water is ours: and he called the name of the well Esek; because they strove with him.

And they digged another well, and strove for that also: and he called the name of it Sitnah.