9. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from al-Marzaban ibn al-Nu’man in a marfu‘ manner has said the following
“He (the Imam) has said that the Messenger of Allah, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, once said, ‘Why do I see you, people, with yellow teeth, what is the matter with you, why do you not brush your teeth?”