[Abu 'Eisa said:] There are narrations on this topic from 'Ali, 'Imran bin Husain, and Al-Hakam bin 'Amr Al-Ghifari. This Hadith is Hasan Sahih.
In-book : Book 23, Hadith 39
English translation : Vol. 3, Book 21, Hadith 1707
23. The Book on Jihad
باب مَا جَاءَ أَنَّ الأُذُنَيْنِ مِنَ الرَّأْسِ