عن أنس رضي الله عنه
أن رسول الله صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «البصاق في المسجد خطيئة، وكفارتها دفنها»
The Messenger of Allah (sallallahu alayhi wa sallam) said, “Spitting in the mosque is a sin, and its expiation is that the spittle should be buried in earth.”.
Riyad as-Salihin 1693, Book 18, The Book of the Prohibited actions, Hadith 183. 1 min read