Sahih Bukhari 410

Narrated Abu Huraira and Abu Sa`id: Allah's Apostle saw some expectoration on the wall of the mosque; he took gravel and scraped it off and said, If anyone of you wanted to spit, he should neither spit in front of him nor on his right but could..

Narrated Anas: The Prophet said, None of you should spit in front or on his right but he could spit either on his left or under his foot. ..

Narrated Anas bin Malik: The Prophet said, A faithful believer while in prayer is speaking in private to his Lord, so he should neither spit in front of him nor to his right side but he could spit either on his left or under his foot. ..

Narrated Abu Sa`id: The Prophet 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. ..

Narrated Anas bin Malik: The Prophet said, Spitting in the mosque is a sin and its expiation is to bury it. ..

Narrated Abu Huraira: Prophet said, If anyone of you stands for prayer, he should not spit in front of him because in prayer he is speaking in private to Allah and he should not spit on his right as there is an angel, but he can spit either on..