LXX Gen 20:13

ἐγένετο δὲ ἡνίκα ἐξήγαγέν με ὁ θεὸς ἐκ τοῦ οἴκου τοῦ πατρός μου καὶ εἶπα αὐτῇ ταύτην τὴν δικαιοσύνην ποίησον ἐπ’ ἐμέ· εἰς πάντα τόπον οὗ ἐὰν κεῖ· εἰπὸν ἐμὲ ὅτι Ἀδελλφός μού ἐστιν.

So when God had me journey from my father’s house, I said to Sarah, ‘This is how you can show your loyalty to me: Wherever we go, say of me, “He is my brother.”’”