It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Allah Almighty will raise this Stone (the Black Stone) on the Day of Resurrection. It will have two eyes with which it sees and a tongue with which it speaks, and it will bear witness in favour of whoever touched it in truth."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12426