Genesis 19:36

Overview - Genesis 19
1	Lot entertains two angels.
4	The vicious Sodomites are smitten with blindness.
12	Lot is warned, and in vain warns his sons-in-law.
15	He is directed to flee with his family to the mountains, but obtains leave to go into Zoar.
24	Sodom and Gomorrah are destroyed.
26	Lot's wife becomes a pillar of salt.
29	Lot dwells in a cave.
31	The incestuous origin of Moab and Ammon.

Genesis 19:36  (King James Version)
Thus were both the daughters of Lot with child by their father.