Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that the Prophet (peace and blessings be upon him) said: "Allah Almighty will raise the Black Stone on the Day of Resurrection with two eyes with which it sees and a tongue with which it speaks; it will bear witness concerning whoever touched it in truth."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9232