Musannaf Ibn Abi Shayba 13:2055

Abu Bakr narrated to us, he said: Ibn Abi Za'idah narrated to us, from Hisham, from 'Urwah, from Sa'id ibn Zayd, he said: I heard the Prophet, may Allah bless him and grant him peace, saying: "Whoever takes a span of land unjustly, it will be tied around his neck from seven earths."