Reference for Genesis 19:33

וַתַּשְׁקֶ֧יןָ אֶת־אֲבִיהֶ֛ן יַ֖יִן בַּלַּ֣יְלָה ה֑וּא וַתָּבֹ֤א הַבְּכִירָה֙ וַתִּשְׁכַּ֣ב אֶת־אָבִ֔יהָ וְלֹֽא־יָדַ֥ע בְּשִׁכְבָ֖הּ וּבְקׄוּמָֽהּ׃

And they made their father drink wine that night. And the first-born went in, and lay with her father; and he knew not when she lay down, nor when she arose.