It is narrated from Sayyiduna Jabir bin Samurah (may Allah be pleased with him); he said: I saw the Seal of Prophethood on the blessed back of the Messenger of Allah (peace and blessings be upon him), and it was like a pigeon's egg. This hadith is sahih (authentic) on the condition of Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Abu Zayd (may Allah be pleased with him); he said: The Messenger of Allah (peace and blessings be upon him) said to me: "O Abu Zayd, come near me and pass your hand over my back." He said: So I came near him, passed my hand over his back, and placed my fingers on the Seal (of Prophethood) and pressed them. He was asked: What was the Seal? He said: A cluster of hair near his shoulder. This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) let the hair of his forehead (nawasi) hang down for as long as Allah willed (as the People of the Book used to do), and then after that he began to part it. This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.

It is narrated from Hariz bin Uthman; he said: I asked Sayyiduna Abdullah bin Busr al-Sulami (may Allah be pleased with him): Did you see the Messenger of Allah (peace and blessings be upon him)? Was he (peace and blessings be upon him) old? He said: There were a few white hairs in his 'anfaqah (the hair below the lower lip). This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Abdullah bin Muhammad bin Aqil that Sayyiduna Anas bin Malik (may Allah be pleased with him) came to Madinah while Umar bin Abd al-Aziz was its governor. He sent a messenger to Anas (may Allah be pleased with him) and said to him: Ask him, did the Messenger of Allah (peace and blessings be upon him) use dye? For I have seen one of his hairs whose colour had changed! Sayyiduna Anas (may Allah be pleased with him) said: The hair of the Messenger of Allah (peace and blessings be upon him) remained black, and if I had counted the white hairs of his head and beard, they would not have been more than eleven. And this change of colour is due to the perfume that the Messenger of Allah (peace and blessings be upon him) used to put on his hair. This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Jabir bin Samurah (may Allah be pleased with him) that in the parting of the blessed head of the Messenger of Allah (peace and blessings be upon him) there were only a few white hairs; when he applied oil, the oil would conceal those hairs. This hadith is sahih (authentic) on the condition of Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it.