Silsilah as-Sahihah 3917 — Black Stone was sent down white; why did it

Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "If it were not for the impurities of ignorance having touched it (the Black Stone), then the pain of a suffering person would be removed by touching it. Other than this stone, there is nothing from Paradise on the earth."