Sahih Muslim
The Book Pertaining to the Excellent Qualities of the Holy Prophet (may Peace be upon them) and His Companions (Kitab Al-Fadail)
Book Number: 030 / Hadith Number: 5776
Jabir b. Samura reported that Allah's Messenger (may peace be upon him) had a broad face with reddish (wide) eyes, and lean heels. Shu'ba reported: I said to Simak: What does this dali-ul-fam mean? And he said: This means broad face. I said: What does this ashkal mean? He said: Long in the slit of the eye. I said: What is this manhus-ul-aqibain? He said: It implies little flesh at the heels.