Genesis 21:34

And Abraham sojourned in the Philistines’ land many days.

Abraham dwelt as a sojourner in the Philistines' land for many days. This belongs to the account of his life after leaving Haran, a period of sojourning and trials of faith in which God repeatedly showed His providence. Its immediate context is his relations and dealings with Abimelech, including their later separation from the Philistine king.

At Beer-sheba, an old camping-ground, Abraham made a covenant with Abimelech concerning the well there, and the name Beer-sheba commemorated their agreement. He first made a covenant of friendship with Abimelech and then calmly raised the wrong done to him by Abimelech's servants over a well, showing that a grievance can be addressed without destroying friendship. At Gerar his experience was similar to Isaac's later experience: his covenant with Abimelech was honored during his lifetime, but after his death the Philistines filled in the wells he had dug.

In the broader chapter, his dealings concerning Hagar and Sarah illustrate that human schemes lead to bondage and trouble, while God's promise brings freedom. Since the chapter places the destruction of Sodom just before Isaac's birth when Abraham lived nearby, the people of Sodom could have learned from Abraham about the second advent and the Judgment.