صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب فضائل المساجد وبنائها وتعظيمهاChapters on Virtues and Construction of Mosques
(598) بَابُ ذِكْرِ الْعِلَّةِ الَّتِي لَهَا أَمَرَ بِدَفْنِ النُّخَامَةِ فِي الْمَسْجِدِThe chapter on the reason for the command to bury phlegm in the mosque
Hadith Q1311
وَالدَّلِيلِ عَلَى أَنَّهُ أَمَرَ بِهِ كَيْ لَا يَتَأَذَّى بِذَلِكَ النُّخَامَةِ مُؤْمِنٌ أَنْ يُصِيبَ جِلْدَهُ أَوْ ثَوْبَهُ فَيُؤْذِيَهُ
And the explanation of the evidence that this ruling was given so that this phlegm does not touch the body or clothes of a believer and cause him harm.
