LXX Gen 26:9

έκάλεσεν δὲ Ἀβιμέλεχ τὸν Ἰσοὰκ καὶ αὐτῷ Ἄρα γε γυνή σού ἐστιν· τί ὅτι εἶπας Ἀδελφή μού ἐστιν ; εἶπεν δὲ αὐτῷ Ἰσαάκ Εἶπα γάρ Μή ποτε ἀποθάνω δι’ αὐτήν.

Abimelech sent for Isaac and said, “So she is really your wife! How could you say, ‘She is my sister’?” Isaac replied, “Because I thought I might die on account of her.”