Moses
Genesis 26:7BSB·traditional attribution

But when the men of that place asked about his wife, he said, “She is my sister.” For he was afraid to say, “She is my wife,” since he thought to himself, “The men of this place will kill me on account of Rebekah, because she is so beautiful.”

John Calvin Reformed @genevareformer

7. And the men of the place asked him. Moses relates that Isaac was tempted in the same manner as his father Abraham, in having his wife taken from him; and without doubt he was so led by the example of his father, that he, being instructed by the similarity of the circumstances, might become associated with him in his faith.

Matthew Henry Presbyterian @wholebiblehenry

Isaac had now laid aside all thoughts of going to Egypt, and, in obedience to the heavenly vision, sets up his staff in Gerar, the country in which he was born (Gen 26:6), yet there he enters into temptation, the same temptation that his good father had been once and again surprised and overcome by, namely, to deny his wife, and to give out that she was his sister.

Commenting on Genesis 26:6-11

John Gill Reformed Baptist @doctorgill

And it came to pass, when he had been there a long time,.... Perhaps some years: for though it is in the original, "when days were prolonged to him there" (b); yet days are sometimes put for years: that Abimelech king of the Philistines looked out at a window; in his own palace, near to which, in all likelihood, were the apartments that Isaac and...