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: Come near to me. I came near to him, then he (peace and blessings be upon him) said: Insert your hand under the shirt and pass it over my back. So when I inserted my hand into his (peace and blessings be upon him) shirt and passed it over his back, the Seal of Prophethood came between my two fingers. Then when he was asked about the Seal of Prophethood, he said that it was some hair between his shoulders.