Ben-ammi's mother was the younger daughter of the prophet Lot. When she was still a maiden, she and her family lived in Sodom, an abode of wickedness and an affront to God. Her sister was Moab's mother.
When God decided to destroy Sodom and Gomorrah for their wickedness, God sent His angels to Lot in order to save Lot and his family from sharing the same fate as the rest of Sodom's inhabitants. Lot invited the angels into his house for protection, but the Sodomites surrounded the house and demanded that Lot hand over the angels, who the Sodomites mistook for young men or boys, so that the Sodomites can sodomize them.
Lot attempted to persuade the Sodomites into marrying and having intercourse with his maiden daughters instead, but the Sodomites rejected the offer. The Sodomites tried to break into Lot's house, but the angels saved Lot and protected the house by blinding the Sodomites.
The angels informed Lot of God's intentions to destroy Sodom and Gomorrah and asked Lot to flee the city with his family. Lot attempted to persuade the intended bridegrooms of his daughters to come with him, but they did not believe him. Ultimately, only Lot and his daughters were saved. Lot's wife (and, presumably, the mother of his daughters) disregarded God's command to not look back at Sodom and was transformed into a pillar of salt.
After the destruction of Sodom and Gomorrah, Lot's daughters mistakenly assumed that they and their fathers were the only remaining humans on the planet. Moab's mother then conceived of a plan to impregnate themselves with her father's sperm.
Our father is aging, and there is not a man on earth [available] to be intimate with us in the customary way [so that we may have children]. Come, let us make our father drunk with wine, and we will lie with him so that we may preserve our family through our father.— Genesis 19:31–19:32 (AMP)
Moab's mother then intoxicated her father with wine and had intercourse with him. She then persuaded her sister to do the same.
Behold, I lay with my father last night; let us make him drunk with wine tonight also, and then you go in and lie with him, so that we may preserve our family through our father.— Genesis 19:34 (AMP)
Lot's daughters were thus impregnated with their father's sperm, and they gave birth to Moab and Ben-ammi, making them the progenitors of the Moabites and the Ammonites.
- Surah 11:78–79
- Surah 15:71
- Genesis 19:7–19:9