Sunan Abi Dawud

Narrated Al-Bara' : 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