Musannaf Ibn Abi Shayba 13:2428

Abu Bakr narrated to us, he said: Ishaq al-Azraq narrated to us, from Hisham, from al-Hasan, he said: Whoever revives dead land that did not belong to anyone before him, then it is his. Hisham said: And Umar ibn Abd al-Aziz wrote regarding that.