كتاب اللباس والزينة
37  
The Book of Clothes and Adornment
(9)
Chapter: The Prohibition Of Letting One's Garment Drag Out Of Pride, And The Extent To Which It Is Permissible To Let It Hang Down And The Extent To Which It Is Recommended
(9)
باب تَحْرِيمِ جَرِّ الثَّوْبِ خُيَلاَءَ وَبَيَانِ حَدِّ مَا يَجُوزُ إِرْخَاؤُهُ إِلَيْهِ وَمَا يُسْتَحَبّ
Sahih Muslim 2086

Ibn 'Umar reported:

I happened to pass before Allah's Messenger (may peace be upon bin) with my lower garment trailing (upon the ground). He said: 'Abdullah, tug up your lower garment,, I tugged it up, and he again said: Tug it still further, and I tugged it still further and I went on tugging it afterward, whereupon some of the people said: To what extent? Thereupon he said: To the middle of the shanks.
حَدَّثَنِي أَبُو الطَّاهِرِ، حَدَّثَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي عُمَرُ بْنُ مُحَمَّدٍ، عَنْ عَبْدِ اللَّهِ بْنِ، وَاقِدٍ عَنِ ابْنِ عُمَرَ، قَالَ مَرَرْتُ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم وَفِي إِزَارِي اسْتِرْخَاءٌ فَقَالَ ‏"‏ يَا عَبْدَ اللَّهِ ارْفَعْ إِزَارَكَ ‏"‏ ‏.‏ فَرَفَعْتُهُ ثُمَّ قَالَ ‏"‏ زِدْ ‏"‏ ‏.‏ فَزِدْتُ فَمَا زِلْتُ أَتَحَرَّاهَا بَعْدُ ‏.‏ فَقَالَ بَعْضُ الْقَوْمِ إِلَى أَيْنَ فَقَالَ أَنْصَافِ السَّاقَيْنِ ‏.‏
Reference : Sahih Muslim 2086
In-book reference : Book 37, Hadith 77
USC-MSA web (English) reference : Book 24, Hadith 5200
  (deprecated numbering scheme)