Abimelech Tells Isaac We Saw Your Father and We Saw You

Midrash Aggadah, Genesis 26:28

"And they said, 'We have surely seen' (Genesis 26:28). [The doubled wording teaches:] We saw the deeds of your father, and we saw your deeds; and just as the Holy One, blessed be He, was with your father Abraham, so was He with you. And therefore we said, 'Let there now be an oath' — that just as there was [an oath] between us and your father Abraham, so shall it be between us and you."

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