Musnad Abu Ya'la al-Mawsili 248:16

'Abd al-Rahman ibn Salih narrated to us, 'Abd al-Rahim narrated to us, Isra'il narrated to us, from Simak, that he heard Jabir ibn Samurah saying: The Messenger of Allah (ﷺ) had gray hairs at the front of his head and his beard. When he applied oil and combed it, it would not be apparent, but when it was disheveled, I would see it. He had a thick beard. A man said, "Was his face like a sword?" He said, "No, rather like the sun and the moon, round." He said, "And I saw his seal (the Seal of Prophethood) near his shoulder, like a pigeon's egg, resembling his body."