Bereshis 19:35-37

Orthodox Jewish Bible

³⁵ And they made their av drink yayin balailah also; and the younger arose, and lay with him; and he had da’as not when she lay down, nor when she arose.

³⁶ Thus were both the banot of Lot with child by their av.

³⁷ And the bechirah bore ben, and called shmo Moav; the same is the Avi Moav unto this day.