Authority of Ibn Abbas (may Allah be pleased with them), that the Messenger of Allah (blessings and peace be upon him) said, "The Black Stone descended from Paradise much whiter than milk, but it was turned black by the sins committed by mankind." (AI-Tirmidhi Book 05, Vol. 2, p. 112)

Ibn Khuzaima and Ibn Habban, in their two Sahihs, related that the Messenger of Allah (blessings and peace be upon him) said that the Black Stone would be resurrected on the Day of Judgement with two eyes and a tongue, and would be a witness to those who sincerely touched and kissed it. ( Al-Tirmidhi Book8, Vol. 2, p. 193)