Sunan Abi Dawud Book 35, Hadith 24
A man came to the Messenger of Allah (ﷺ) and he had the mark of yellowness (of saffron). The Prophet (peace be upon him rarely mentioned a thing which he disliked before a man. When he went away, he said: Would that you tell this man that he should wash this off him.
When the Prophet of Allah (ﷺ) conquered Makkah. The people of Makkah began to bring their boys and he would invoke a blessing on them and rub their heads. I was brought, but as I had been perfumed with khaluq, he did not touch me because of the khaluq.
I did not see any man with locks hanging down to shoulders in red robe more beautiful than the Messenger of Allah (ﷺ). Muhammad b. Sulaiman added: He had hair which touched his shoulders.
Abu Dawud said: Isra'il also transmitted it in a similar way from Abu Ishaq saying: "(his hair) touched his shoulders". Shu'bah added: (His hair) reached the lobes of his ears.