Abdullah bin Tha'labah narrates that he came to Abd al-Rahman bin Ka'b bin Malik, who was wrapped in a threadbare lower garment and a worn single-layer cloth; he was blind and was being led. He said: I greeted him, and he said: Who is this? I said: Abdullah bin Tha'labah. He said: The brother of Banu Harithah? I said: Yes. He said: And the in-law of Juhaynah? I said: Yes. He asked: Have you heard your father narrate a hadith that he narrated from the Prophet (peace and blessings be upon him)? He said: I do not know. He asked: Did you hear your father say: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever seizes the wealth of a Muslim man by means of a false oath, a black spot will appear in his heart which nothing will change until the Day of Resurrection"? I said: No. This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it with this wording.