Abu Dawud Book 27, Hadith Number 4073.

Chapter : Hanging down the lower garment below the ankles.

Narated By Abu Jurayy Jabir ibn Salim al-Hujaymi : I saw a man whose opinion was accepted by the people, and whatever he said they submitted to it. I asked: Who is he? They said: This is the Apostle of Allah (PBUH). I said: On you be peace, Apostle of Allah, twice. He said: Do not say “On you be peace,” for “On you be peace” is a greeting for the dead, but say “Peace be upon you”.

I asked: You are the Apostle of Allah (may peace be upon you)? He said: I am the Apostle of Allah Whom you call when a calamity befalls you and He removes it; when you suffer from drought and you call Him, He grows food for you; and when you are in a desolate land or in a desert and your she-camel strays and you call Him, He returns it to you.

I said: Give me some advice. He said: Do not abuse anyone. He said that he did not abuse a freeman, or a slave, or a camel or a sheep thenceforth. He said: Do not look down upon any good work, and when you speak to your brother, show him a cheerful face. This is a good work. Have your lower garment halfway down your shin; if you cannot do it, have it up to the ankles. Beware of trailing the lower garment, for it is conceit and Allah does not like conceit. And if a man abuses and shames you for something which he finds in you, then do not shame him for something which you find in him; he will bear the evil consequences for it.