When the men there asked about his wife, he said that she was his sister. He would not admit that she was his wife, because he was afraid that the men there would kill him to get Rebecca, who was very beautiful. 1
When Isaac had been there for some time, King Abimelech looked down from his window and saw Isaac and Rebecca making love.
Abimelech sent for Isaac and said, "So she is your wife! Why did you say she was your sister?" He answered, "I thought I would be killed if I said she was my wife."
"What have you done to us?" Abimelech said. "One of my men might easily have slept with your wife, and you would have been responsible for our guilt."
Abimelech warned all the people: "Anyone who mistreats this man or his wife will be put to death."
Isaac sowed crops in that land, and that year he harvested a hundred times as much as he had sown, because the Lord blessed him.
He continued to prosper and became a very rich man.
Because he had many herds of sheep and cattle and many servants, the Philistines were jealous of him.
So they filled in all the wells which the servants of his father Abraham had dug while Abraham was alive.
Then Abimelech said to Isaac, "Leave our country. You have become more powerful than we are."
So Isaac left and set up his camp in Gerar Valley, where he stayed for some time.