أَخْبَرَنَا مُحَمَّدُ بْنُ الْعَلاَءِ، قَالَ حَدَّثَنَا ابْنُ إِدْرِيسَ، عَنْ عُبَيْدِ اللَّهِ، وَمَالِكٍ، وَابْنِ، جُرَيْجٍ عَنِ الْمَقْبُرِيِّ، عَنْ عُبَيْدِ بْنِ جُرَيْجٍ، قَالَ قُلْتُ لاِبْنِ عُمَرَ رَأَيْتُكَ تَلْبَسُ هَذِهِ النِّعَالَ السِّبْتِيَّةَ وَتَتَوَضَّأُ فِيهَا ‏.‏ قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَلْبَسُهَا وَيَتَوَضَّأُ فِيهَا ‏.‏

It was narrated that 'Ubaid bin Juraih said: "I said to Ibn 'Umar: 'I see you are wearing Sibtiyyah sandals, [1] and you performed Wudu' in them.' He said: 'I saw the Messenger of Allah (PBUH) wearing then and performing Wudu' in them.'" [1] Made of hairless, tanned leather. Translation Not Available

Book Ref: Sunan An Nisai Book 1 Hadith 117
Web Ref:  Sunan An Nisai Vol 1 Book 1 Hadith 117