Abd al-Rahman bin Ka'b bin Malik said: I heard your father, Sayyiduna Abu Umamah (may Allah be pleased with him), say: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever seizes the wealth of a Muslim by a false oath, it becomes a black spot on his heart, which nothing can remove until the Day of Resurrection."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 797