Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates: The Prophet (peace and blessings of Allah be upon him) liked to keep a stick in his hand. One day he entered the mosque. A stick was in his hand. He saw phlegm stuck on the wall in the direction of the qiblah of the mosque, so he scraped it off and cleaned it thoroughly. Then, in a state of anger, he turned towards the people and said: Would any one of you like that someone comes before him and spits towards his face? When a person stands to pray, his Lord is in front of him and an angel is on his right side, so he should not spit in front of him or to his right side, rather he should spit to his left side under his left foot. And if the spit comes quickly, then he should do like this, that is, spit into his garment and rub it in.