Genesis 26:1

And there was a famine in the land, beside the first famine that was in the days of Abraham. And Isaac went unto Abimelech, king of the Philistines, unto Gerar. The adventures of Isaac, as related in this Chapter, have their parallels in the life of Abraham, and show that human nature does not change, but remains selfish and sinful from one generation to the next. A famine having struck Canaan, Isaac found it advisable to journey down to the land of the Philistines, the hereditary title of whose king was Abimelech.