Musnad Abu Ya'la al-Mawsili 41:12

Yahya ibn Ayyub narrated to us, Ismail ibn Ja'far narrated to us, al-'Ala' informed me, from 'Abbas ibn Sahl ibn Sa'd, from Sa'id ibn Zayd, from the Prophet, may Allah bless him and grant him peace, who said: "Whoever seizes a span of land unjustly, Allah will encircle him with it on the Day of Resurrection from seven earths."