Genesis 19:34-36

Amplified Bible, Classic Edition

³⁴ Then the next day the firstborn said to the younger, See here, I lay last night with my father; let us make him drunk with wine tonight also, and then you go in and lie with him, so that we may preserve offspring (our race) through our father.

³⁵ And they made their father drunk with wine again that night, and the younger arose and lay with him; and he was not aware of it when she lay down or when she arose.

³⁶ Thus both the daughters of Lot were with child by their father.