It is narrated from Sayyiduna Ya'la (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever takes any part of the land unjustly will come on the Day of Resurrection carrying its soil into the gathering place (al-Mahshar)."
Hadith Referenceالمعجم الكبير للطبراني / باب الياء / 18894