Sayyiduna Shaddad bin Aws (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: "Whoever wrongfully takes even a handspan of land will be made to wear it as a collar from seven earths, and whoever is killed defending his property is a martyr."
Hadith Referenceالمعجم الكبير للطبراني / باب الشين / 7139