וַיְהִ֞י כַּאֲשֶׁ֧ר הִתְע֣וּ אֹתִ֗י אֱלֹהִים֮ מִבֵּ֣ית אָבִי֒ וָאֹמַ֣ר לָ֔הּ זֶ֣ה חַסְדֵּ֔ךְ אֲשֶׁ֥ר תַּעֲשִׂ֖י עִמָּדִ֑י אֶ֤ל כָּל־הַמָּקוֹם֙ אֲשֶׁ֣ר נָב֣וֹא שָׁ֔מָּה אִמְרִי־לִ֖י אָחִ֥י הֽוּא׃
And it came to pass, when God caused me to wander from my father’s house, that I said unto her: This is thy kindness which thou shalt show unto me; at every place whither we shall come, say of me: He is my brother.’
Read halakhic rulings (Jewish law) on Genesis 20:13: and classical halakhic sources.