Genesis 21:32
"Thus they made a covenant at Beersheba: then Abimelech rose up, and Phichol the chief captain of his host, and they returned into the land of the Philistines."
Cross References (ranked by relevance)
And Pathrusim, and Casluhim, (out of whom came Philistim,) and Caphtorim.
The God of Abraham, and the God of Nahor, the God of their father, judge betwixt us. And Jacob sware by the fear of his father Isaac.
And there came one that had escaped, and told Abram the Hebrew; for he dwelt in the plain of Mamre the Amorite, brother of Eshcol, and brother of Aner: and these were confederate with Abram.
And the children of Israel did evil again in the sight of the LORD; and the LORD delivered them into the hand of the Philistines forty years.
And it came to pass, when Pharaoh had let the people go, that God led them not through the way of the land of the Philistines, although that was near; for God said, Lest peradventure the people repent when they see war, and they return to Egypt:
And it came to pass, when he had been there a long time, that Abimelech king of the Philistines looked out at a window, and saw, and, behold, Isaac was sporting with Rebekah his wife.
Then Jonathan and David made a covenant, because he loved him as his own soul.
And Abraham took sheep and oxen, and gave them unto Abimelech; and both of them made a covenant.
For he had possession of flocks, and possession of herds, and great store of servants: and the Philistines envied him.