Genesis 19:34 New International Version (NIV)

³⁴ The next day the older daughter said to the younger, “Last night I slept with my father. Let’s get him to drink wine again tonight, and you go in and sleep with him so we can preserve our family line through our father.”

Genesis 19:36 New International Version (NIV)

³⁶ So both of Lot’s daughters became pregnant by their father.

Genesis 38:18 New International Version (NIV)

¹⁸ He said, “What pledge should I give you?”

“Your seal and its cord, and the staff in your hand,” she answered. So he gave them to her and slept with her, and she became pregnant by him.