Abū Hurairah Radi Allāhu ‘anhu narrates that there was a black man or black woman (a narrator experienced question as as to whether it had been a male or female) who employed to sweep the Masjid. She/he handed away. Nabi Sallallāhu ‘alaihi wa Sallam asked (his companions) concerning this individual, https://gorillasocialwork.com/story20134856/a-secret-weapon-for-how-to-clean-mosques