Read Genesis 19:33 Using Other Translations
And they made their father drink wine that night: and the firstborn went in, and lay with her father; and he perceived not when she lay down, nor when she arose.
So they made their father drink wine that night. And the firstborn went in and lay with her father. He did not know when she lay down or when she arose.
So that night they got him drunk with wine, and the older daughter went in and had intercourse with her father. He was unaware of her lying down or getting up again.