Let thy words be few. Ecclesiastes 5:2
26 1 There was a famine in the land, so God came to Isaac and said,
2 Don't go to Egypt. Dwell in the land I'll tell you about.
3I'll be with you, bless you and your seed, give you lots of countries, and do what I told your father I'd do.
4I'll multiply your seed like the stars of heaven, and all nations will be blessed by your seed..
5I'll do all these things for you because your father obeyed me.
6 So Isaac went to Gerar.
7 When Isaac arrived in Gerar, some men asked him about his wife, and he said, "She's my sister." (He didn't say, "she's my wife", because he was afraid they'd kill him, since Rebekah was so beautiful.)
8 One day, Abimelech looked out his window and saw Isaac sporting with Rebekah.
9 He called Isaac and said to him,
What have you done to us?
10 Someone might have had sex with your wife, which would have brought guilt on all of us.
11 Then Abimelech said to his people, "Anyone who touches Isaac or Rebekah will be killed."
16 But one day Abimelech said to Isaac,
23 So Isaac left Gerar and traveled to Beersheba.
Get away from us. You're much mightier than we.
34-35 Esau took two Hittite women for wives. Isaac and Rebekah didn't approve of these marriages.
Isaac visits king Abimelech, repeating the same "she's my sister" lie that his father used twice, once to king Abimelech in Genesis 20. But was it the same king Abimelech? If so, he must have been very old, since Abraham's visited when he was 100 years old, and he died at the age of 175, before Isaac's visit.
Whether Abimelech was the same king Abraham and Sarah lied to or not, there is another problem with this very unlikely story. The Philistines didn't yet exist in the region at the time this story supposedly occured, and wouldn't for another 600 years or so.
Because they were Hittites, presumably -- not because he married two women.