The hair of the Messenger of Allah ﷺ reached halfway down his ears.
أخبرنا إسحق بن إبراهيم قال أنبأنا عبد الرزاق قال حدثنا معمر عن ثابت
كان شعر رسول الله ﷺ إلى أنصاف أذنيه
No references are available.
Its isnad is sahih. Abu Dawud narrated it in Kitab al-Tarajjul, chapter on what has been said about hair, no. 4185, from the hadith of Abdul-Razzaq, through him, and it is also found in al-Kubra, no. 9323.