New Defender's Study Bible Notes
26:7 my sister. Critics allege that this is merely another version of the story of Abraham’s experience in Gerar (Genesis 20:1-8). This is not possible; the scribal “redactors” whom these same critics think brought the different components of Genesis together would have been far too shrewd to deliberately create such an obvious barrier to its acceptance by their readers. The event must have taken place as described. Isaac and Rebekah repeated the same fabrication that Abraham and Sarah had attempted over a century earlier, for essentially the same reasons, and with essentially the same results–human rebuke for their deception, but God’s protection in spite of this.