It is narrated from Hazrat Abu Malik Ash'ari (may Allah be pleased with him) that the Noble Prophet, the Leader of both worlds (peace and blessings be upon him), said: The greatest betrayal in the sight of Allah is betrayal in a span of land. You see that two men are neighbors in a piece of land or a house, yet one of them unjustly takes a span from his companion's share. On the Day of Resurrection, the one who does this will have a collar made from that portion, from all seven earths, placed around his neck.