From Sahih Muslim (Hadith 6070):
Jabir b. Samura reported that Allah's Messenger (ﷺ) 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
Reference: Muslim 6070