It is narrated from Sayyiduna Abu Zaid (may Allah be pleased with him), he says: The Messenger of Allah (peace and blessings be upon him) said to me: O Abu Zaid! Come close to me and pass your hand over my back. At the same time, the Prophet (peace and blessings be upon him) removed the cloth from his back, so I passed my hand over the blessed back of the Prophet (peace and blessings be upon him) and took the Seal of Prophethood between my fingers and pressed it to see. He was asked: What was that seal like? He said: It was on the shoulder of the Prophet (peace and blessings be upon him) and there were hairs grown on it.