‏الصلاة : Hadeeth No:1118 Abu Sa'id al-Khudri reported: The Prophet of Allaah (sallAllaahu alayhi wa sallam) saw sputum sticking to the Qibla of the mosque. He scratched it off with a pebble and then forbade spitting on the right side or in front, but (it is permissible) to spit on the left side or under the left foot....

‏الإمارة : Hadeeth No:4507 Abu Huraira has narrated this hadith with a slight variation of words....