Riyad as-Saliheen 1694
'Aishah (May Allah be pleased with her) said:
The Messenger of Allah ﷺ saw spittle or snot or sputum, sticking to the wall towards Qiblah and scratched it off.
[Al-Bukhari and Muslim].
وعن عائشة رضي الله عنها أن رسول الله ﷺ رأى في جدار القبلة مخاطا أو بزاقا أو نخامة فحكه ((متفق عليه)).
Classification
Sahih (Authentic)
References
Riyad as-Saliheen 1694
Riyad as-Saliheen Book of Prohibited actions, Hadith 184