Abd al-Rahman bin Ka'b (may Allah have mercy on him) said to Abdullah bin Tha'labah: I heard your father, Sayyiduna Tha'labah (may Allah be pleased with him), say: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever seizes the right of another person by a false oath, a black spot of hypocrisy will be placed in his heart, which nothing will remove until the Day of Resurrection."
Hadith Referenceالمعجم الكبير للطبراني / باب الثاء / 1370