Shama-il Tirmidhi Chapter 001, Hadith Number 008 (008).

Jaabir bin Samurah (Radiallahu anhu) says: "Rasulullah (Sallallahu alaihe wasallam) had a wide mouth. There were red lines in the whiteness of his eyes. He had little flesh on his heels."

Commentary:
It is desirable for Arab men to have wide mouths. According to some a wide mouth means eloquence (fluency of language). The translation adopted in the description of the eyes has been taken from accepted sayings. However in this Hadith, Imam Tirmidi has translated this to mean wide eyes, as a narrator of this hadith has done, which according to the linguists is not correct.