Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) saw some nasal mucus stuck on the Qiblah side of the mosque, so the blessed face of the Prophet (peace and blessings be upon him) turned red (due to anger). Then an Ansari woman came, scraped off that filth and cleaned it, and applied perfume made of saffron at that place. So the Messenger of Allah (peace and blessings be upon him) said: "How excellent this deed is." Imam Abu Bakr (may Allah have mercy on him) says that this hadith is extremely rare (gharib).