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."
حَدَّثَنَا هَنَّادُ بْنُ السَّرِيِّ، قَالَ‏:‏ حَدَّثَنَا عَبْثَرُ بْنُ الْقَاسِمِ، عَنْ أَشْعَثَ يَعْنِي ابْنَ سَوَّارٍ، عَنْ أَبِي إِسْحَاقَ، عَنْ جَابِرِ بْنِ سَمُرَةَ، قَالَ‏:‏ رَأَيْتُ رَسُولَ اللهِ صلى الله عليه وسلم، فِي لَيْلَةٍ إِضْحِيَانٍ، وَعَلَيْهِ حُلَّةٌ حَمْرَاءُ، فَجَعَلْتُ أَنْظُرُ إِلَيْهِ وَإِلَى الْقَمَرِ، فَلَهُوَ عِنْدِي أَحْسَنُ مِنَ الْقَمَرِ‏.‏
English reference : Book 1, Hadith 9
Arabic reference : Book 1, Hadith 10