Musnad Abu Ya'la al-Mawsili 41:5

Abu Khaythama narrated to us, Muhammad ibn Khazim narrated to us, Hisham ibn Urwah narrated to us, from his father, from Sa'id ibn Zayd, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever wrongs [another by taking] a span of land without right, it will be encircled around his neck from seven earths."