וַיֹּ֧אמֶר אַבְרָהָ֛ם אֶל־שָׂרָ֥ה אִשְׁתּ֖וֹ אֲחֹ֣תִי הִ֑וא וַיִּשְׁלַ֗ח אֲבִימֶ֙לֶךְ֙ מֶ֣לֶךְ גְּרָ֔ר וַיִּקַּ֖ח אֶת־שָׂרָֽה׃
And Abraham said of Sarah his wife: ‘She is my sister.’ And Abimelech king of Gerar sent, and took Sarah.
Read halakhic rulings (Jewish law) on Genesis 20:2: and classical halakhic sources.