Sayyiduna Ya'la bin Murrah (may Allah be pleased with him) said: I heard the Prophet (peace and blessings be upon him) saying: "Any man who unjustly takes a hand-span of land, Allah Almighty will make him carry it down to the last layer of the seven earths; then on the Day of Resurrection it will be placed around his neck as a collar until judgement is passed between the people."
Hadith Referenceالمعجم الكبير للطبراني / باب الياء / 18896