Shama-il Tirmidhi Chapter 1, Hadith Number 9 (9).

It is related from Jaabir (Radiallahu anhu) that he said: “I once saw Rasulullah (Sallallahu alaihe wasallam) on the night of a full moon. On that night he wore red clothing. At times I looked at the full moon and at times at Rasulullah (Sallallahu alaihe wasallam). Ultimately I came to the conclusion that Rasulullah (Sallallahu alaihe wasallam) was more handsome, beautiful and more radiant than the full moon.”