The hair of the Messenger of Allah ﷺ reached halfway down his ears.
حدثنا عبد الرزاق حدثنا معمر عن أشعث بن عبد الله
كان شعر رسول الله ﷺ إلى أنصاف أذنيه
No references are available.
Its isnad is sahih. Ashath bin Abdullah Huddani is truthful, and he has narrations recorded by the four (Sunan compilers), and this has already appeared at 12057.