سنن النسائي 1

It was narrated from Abu Hurairah that the Prophet (ﷺ) said:"When any one of you wakes from sleep, let him not dip his hand in (the water he uses for) his Wudu' until he has washed it three times, for none of you knows where his hand spent the night

Rapporté par Abu Hurairah : Le Prophète (ﷺ) a dit : "Quand l’un de vous se réveille, qu’il ne plonge pas sa main dans l’eau pour ses ablutions avant de l’avoir lavée trois fois, car personne ne sait où sa main a passé la nuit