Sayyiduna Abu Hurairah (may Allah be pleased with him) and Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) saw phlegm on the wall of the mosque, so the Messenger of Allah (peace and blessings be upon him) took a pebble and cleaned it. Then he said: When any person spits, he should not spit in front of him or to his right side, but rather to his left side or under his foot.