Parashas Toldos · Passuk 26:7
When the men of the place asked him about his wife, he said, “She is my sister,” for he was afraid to say “my wife,” thinking, “The men of the place might kill me on account of Rivkah, for she is beautiful.”
Rashi on Bereishis 26:7 (classical source on this passuk; not listed as a numbered Torah Temimah unit here).
Lemma / focus: לאשתו.
English: Concerning his wife—as in “Say of me, He is my brother.”
Derash on the verse (Rashi) — not a formal named middah of the 13: the syntax of the question is clarified by parallel usage.
When asked about his wife, Yitzchak said she was his sister, fearing the men of the place would kill him because of Rivkah’s beauty.