Sunan an Nasai
117
Sahih+2

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 (ﷺ) wearing then and performing Wudu' in them.'" [1] Made of hairless, tanned leather

SahihAbu Ghuddah
SahihAl-Albani