Sahih Bukhari Volume 007, Book 072, Hadith Number 675.
Narrated By 'Abdullah bin 'Umar : The Prophet said Allah will not look, on the Day of Resurrection at the person who drags his garment (behind him) out of conceit. On that Abu Bakr said, "O Allah's Apostle! One side of my Izar hangs low if I do not take care of it." The Prophet said, 'You are not one of those who do that out of conceit."