Sahih al-Bukhari 414
صحيح البخاري#414Sahihحَدَّثَنَا عَلِيٌّ، قَالَ حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا الزُّهْرِيُّ، عَنْ حُمَيْدِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ أَبِي سَعِيدٍ،. أَنَّ النَّبِيَّ صلى الله عليه وسلم أَبْصَرَ نُخَامَةً فِي قِبْلَةِ الْمَسْجِدِ فَحَكَّهَا بِحَصَاةٍ، ثُمَّ نَهَى أَنْ يَبْزُقَ الرَّجُلُ بَيْنَ يَدَيْهِ أَوْ عَنْ يَمِينِهِ، وَلَكِنْ عَنْ يَسَارِهِ أَوْ تَحْتَ قَدَمِهِ الْيُسْرَى. وَعَنِ الزُّهْرِيِّ سَمِعَ حُمَيْدًا عَنْ أَبِي سَعِيدٍ نَحْوَهُ.
Narrated Abu Sa`id:The Prophet (ﷺ) saw sputum on (the wall of) the mosque in the direction of the Qibla and scraped it off with gravel. Then he forbade Spitting in front or on the right, but allowed it on one's left or under one's left foot
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 8:64