It is narrated from Sayyiduna Amr bin Awf bin Milhah al-Muzani (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever alters the boundary markers of land, upon him will be the curse of Allah and His wrath on the Day of Resurrection; Allah will not accept from him any voluntary or obligatory act of worship."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14105