Now, something unseen by anything, and the dam called Al-Lafun was built, and water was made to flow through it. Joseph the Truthful, peace be upon him, and this was when his age increased and the king wanted his rest and to withdraw him from service. And his retinue, his wealth, his descendants, and his father's lineage were mentioned. And the Fayoum was filled with it, and Al-Qayyum became a lake into which the waters flowed, and it was a land of thickets and reeds. And the king disliked it because it was a burden to him. So when he saw it for Joseph, he set out towards the region of Tahwa and dug the canal called Al-Muntaha until he reached the place of Al-Lafun. Then he built Al-Lafun and widened it with stones, lime, mud, and shells like a high wall. And he placed a gate in the middle at its top. And behind it, he dug a canal that entered Al-Qayyum from the east. And he made a western canal connected to this canal, which passed outside Al-Qayyum with a place called Tanhament. So the water came out of the dam into the eastern canal, and it flowed to the Nile. And the water of the western canal flowed into the desert of Tanhament. So no water remained except that it flowed out and remained. And this was in a few days. Then he ordered that they learn to build dams and to build them. And the Andalusians and the wise men were appointed. And this was at a time when the water flowed into the Nile, entering at the head of the canal called Al-Muntaha, and it flowed until it reached Al-Lafun, and it pushed it into the canal of Al-Qayyum. And the water flowed to it, and it became abundant and widespread, and it became a lake. And this was in seventy days. When the king looked at it, he said, "This work took a hundred days," so it was named Al-Qayyum. Then Joseph, peace be upon him, said to the king, "I have wisdom, so appoint me one household from each district of the land of Egypt." So he agreed to this. And Joseph ordered Al-Qayyum to build a village for each of these households. And they did so, and the number of these villages was...