Now when God ravaged and destroyed the cities of the plain [of Siddim], He remembered Abraham [and for that reason], and He sent [Abraham’s nephew] Lot out of the midst of the destruction, when He destroyed the cities in which Lot had lived.

Only the land of the priests he did not buy, for the priests had an allotment from Pharaoh, and they lived on the amount which Pharaoh gave them, so they did not sell their land.