AHMAD 23915:
from Bilāl —
I saw the Messenger of Allah ﷺ wiping over his leather slippers (when doing wudoo’). (Using translation from Aḥmad 216)
أحمد ٢٣٩١٥:
عن بلال —
كَانَ رَسُولُ اللهِ ﷺ يَمْسَحُ عَلَى الْخُفَّيْنِ