It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) saw phlegm towards the qiblah of the mosque, so he rubbed it and cleaned it with a pebble. And he forbade a person from spitting to his right side or in front of him (during prayer). And he said: "He should spit to his left side or under his left foot (on the unpaved ground)."