The Messenger of Allah ﷺ said, "The Black Stone descended from Paradise whiter than milk, but the sins of the children of Adam blackened it."
قال رسول الله ﷺ: نزل الحجر الأسود من الجنة، وهو أشد بياضا من اللبن فسودته خطايا بني آدم.
Tirmidhi (877) narrated it from Qutayba, who said, Jareer narrated to us, from Ata bin Saaib, from Saeed bin Jubayr, from Ibn Abbas, and he mentioned it. Tirmidhi said, "hasan sahih." Ibn Khuzayma graded it sahih (2733) and narrated it via Jareer and Ziyad bin Abdullah, both of them from Ata bin Saaib.I say, it contains Ata bin Saaib, who was among those whose memory became confused, and Jareer is among those who narrated from him after that confusion set in. However, Nasai (2935) and Imam Ahmad (2795) both narrated it from the hadith of Hammad, from Ata bin Saaib, with his chain, similarly, except that Nasai mentioned it in abbreviated form. Hammad here is Ibn Salama, who is among those who heard from Ata before his confusion set in. With this, the chain becomes sahih, for Ata bin Saaib is trustworthy, and the leading scholars have affirmed his trustworthiness.It was also narrated with a chain containing Muhammad bin Abdul-Rahman bin Abu Layla, from Ata bin Abu Rabah, from him, with the wording, "The Black Stone is from the stones of Paradise, and there is nothing on earth from Paradise except it. It was white like maha stone, and were it not for what touched it of the impurity of the pre-Islamic era, no one afflicted with disease would touch it without being cured." Tabarani narrated it in Al-Kabir (11/146). Haythami said in Al-Majmu (3/242), "It contains Muhammad bin Abu Layla, and there is discussion about him." He is correct, for Muhammad bin Abu Layla was described as having poor memory, and in Al-Taqrib it says, "Truthful, but very poor in memory." Despite this, Munziri said in Al-Targhib (1797), "Tabarani narrated it in Al-Awsat and Al-Kabir with a hasan chain."His saying, "kalmaha," with a fatha, means in clarity like crystal.As for what was narrated from Anas as a saying of the Prophet, "The Corner and the Station are two rubies from the rubies of Paradise," it contains Dawud bin Zubarqan. Dhahabi said he is discarded (matruk). Hakim narrated it through his route (1/456).It was also narrated from him as a saying of his own (not attributed to the Prophet), "The Black Stone is from Paradise." Imam Ahmad narrated it (13944) from Yahya bin Saeed, from Shuba, who said, Qatada narrated to us, from Anas, and he mentioned it. Its chain is sahih. It was also narrated as attributed to the Prophet, but that is not correct. Bayhaqi narrated it (5/75), and it contains Umar bin Ibrahim Abdi, from Qatada, from Anas, and in his narration from Qatada there are objectionable elements, as Imam Ahmad said, though in other matters he is trustworthy.On this subject there are other hadiths, as Haythami mentioned in Al-Majmu (3/242), but they are all daif.