‏الصلاة : Hadeeth No:1125 Shu'ba reported: I asked Qatada about spitting, in the mosque. He said: I heard Anas b. Malik say: I heard the Messenger of Allaah (sallAllaahu alayhi wa sallam) say: Spitting in the mosque is a sin, and its expiation is that it should be buried....

‏فضائل الصحابة‏ : Hadeeth No:5916 Sa'd reported Allaah's Prophet (sallAllaahu alayhi wa sallam) as saying to 'Ali: Aren't you satisfied with being unto me what Aaron was unto Moses?...