Hadith 1035
اللهم كما حسنت خلقي فحسن خلقي
"The Prophet (peace be upon him) used to recite (this supplication) when looking in the mirror: «اللهم كما حسنت خلقي فحسن خلقي» That is, O Allah, just as You have made my physical form beautiful, make my character beautiful as well."
