Sahih Muslim Book 24, Hadith Number 5205.

Chapter : It is forbidden to walk with pride, over pleased with fine clothes.

Abu Huraira reported Allah’s Messenger (may peace be upon him) as saying: There was a person who walked with pride because of his (fine) mantles and well pleased with his personality. Allah made him sink in the earth and he would go on sinking in that until the Day of Resurrection.